Users who visit the Google Knol start page see a big announcement on that page stating that “Knol will be moving to Annotum on May 1, 2012″. Google Knol was a Wikipedia-like online service to which Google users contributed articles to. Knol, unlike other services, can be migrated to Annotum, a multi-user WordPress site. Knol users alternatively have the option to download their articles to their computer.

Google Knol will be available until May 1, 2012. The service will be taken offline at this point in time. Knol users can still download or migrate their articles until October 1, 2012 when those options expire as well. Users who migrate will benefit from automatic redirects of their articles.

For Google Wave, the options are nearly the same. Google Wave will become read only on January 31, 2012 which basically means that users will not be able to create or edit waves after this point. Users have until April 30, 2012 to download the Wave data as PDF documents to their computers. There is also an option to export wave to an Open Source project called Workaround that is based on the Apache Wave code base.

Google Gears is deprecated and will no longer be available as of December 2011. The open source project allowed users to make and use web applications offline.

Other services that are discontinued include the Search Timeline feature which displayed a search term’s popularity over time in the search results, Renewable Energy Cheaper than Coal which was an effort on Google’s part to drive down the costs of renewable energy, Friend Connect which could be used to add social features to web sites and Bookmark lists, which allowed users to share bookmarks.

Larry Page is hell-bent to slim-down Google’s operations. Getting rid of services that are not overly popular and concentrating on services that are may be a way to please share holders and make the company more profitable. These service discontinuations on the other hand can have an effect on the overall trust that users have in Google. Why would someone want to use a Google service that is not as popular as Gmail, if there is a chance that Google’s CEO will announce a fourth wave of retirements in the coming months.

The service was based around  real-time character-by character chat typing, drag-and-drop file sharing and had a lot of potential.  Sadly it was limited only to GMail users and didn’t receive such a brilliant reception.

Now Google is pulling the plug before the service even gets out of beta.  They’ve said they will keep the service going until the end of 2010 but then it’s all over.

One of the biggest problems with Wave I felt personally was that is was clearly intended as mass-user service but the limitations of the beta, which was invitation only, just never allowed this to happen.  The service just looked like a blank page.

Either way it looks as though Google’s attempt to challenge the mightly Facebook has failed, at least for now.  We can be certain that Google’s not finished yet, neither is Microsoft which is constantly updating and expanding it’s Live service.

but now we wave a fond goodbye to Google Wave, bon voyage.

One Number is an interesting extension for the Google Chrome browser that acts as a notifier for the four Google services Gmail, Google Reader, Google Wave and Google Voice. It places a single icon in the web browser’s toolbar that displays the number of unread messages as one number.

The main benefit of this approach is that it saves up space in the Chrome toolbar if several Google services are used regularly (the extreme would be a reduction to one icon from four).

All four Google services are monitored by default. The options can be used to disable checks for specific services.

The first step after installation is to log into a Google account by left-clicking the icon in the toolbar and selecting the Log In link there.

The login redirects to the Google account login on the Google website.

The same menu contains a link to the options which can be used to disable and customize specific services (changing the color code or excluding their unread count from appearing in the number that is displayed in the toolbar) as well as server query intervals, timeouts and misc toolbar colors to indicate if multiple services have unread messages.

One Number is a Google service monitor that can be helpful for Googleholics who use at least two of the services that are currently supported by the Chrome extension (it’s also good for monitoring only one service but that would defeat much of its purpose).

The extension is compatible with Google Chrome 4 and can be downloaded from the official Google Chrome extensions website.

The chance is however relatively good that some developers have already created extensions for popular web services. This article will look at five Google Chrome extensions for popular Google web services including Gmail and Google Reader.

Gmail Checker

Gmail Checker is a simple extension that displays a button in the Google Chrome menu bar. This button displays the number of unread email messages in the Gmail account which makes the extension useful as the user will be notified about new Gmail messages without having to visit the Gmail website first. [link]

Google Reader Checker

This is from the same developer who developed the Gmail Checker extension for the Chrome web browser. It is therefor not surprising that it works exactly like that extension. It will display a new button in the Chrome menubar that shows the count of the unread news items in Google Reader. [link]

Google Tasks

The Google Tasks add-on integrates Google Tasks into the web browser by allowing the user to access the tasks directly from within the web browser without having to open the Google Tasks website. [link]

gPDF

This extension allows the user to open pdf documents directly in Google Docs. There are two advantages of this method. First, no pdf reader needs to be installed on the computer system to read pdf documents and second, it will reduce the chance that the document exploits security vulnerabilities in the installed desktop pdf reader. [link]

Google Wave Checker

A basic extension that will display the unread Google Wave messages in the Google Chrome statusbar. [link]

Verdict:

Extensions are finally beginning to appear in greater numbers for the Google Chrome web browser but are hardly a match for the incredible amount of extensions for the Firefox web browser. It is likely that this is not going to change in the near future. The first step to make extensions more popular to both developers and end users would be to add extension capabilities to the public version of the Google browser.

The Google Wave add-on for Firefox informs the user when new messages arrive for him. It works like any other notification add-on and tool available on the Internet these days. It starts by entering the account data of the Google Wave account in the add-on’s settings.

This is required to access the data of the account. It can – and certainly will – turn away security conscious users who do not want to part with their account data. Those who do will from then on be notified of new Google Wave messages in Firefox. The add-on places an icon in the Firefox status bar that is displaying the number of unread messages with the ability to hover over the icon to see previews of the messages.

The Google Wave add-on for Firefox is available at the Mozilla Firefox website. The add-on is compatible with Firefox 3.5.x only at the moment.

Update: Google has stopped the development of Google Wave, and the Firefox add-on has been pulled as a consequence.

Best chance for most interested users is therefor if they have filled out the registration form at the Google Wave website back when it was announced for the first time. Everyone else will have to wait just a bit longer before they can experience the service first hand.

Take a look at the video about Google Wave if you have not heard about it before: (it’s long)

Your best bet currently is to signup at the website as soon as possible for a chance to be included in one of the upcoming invitation rounds (it is likely that there will be more or that Google will let users who have registered join eventually).