The article looks at web applications that enable you to search the site, at plugins for browsers and at external tools. Web applications and browser plugins clearly make the majority of search possibilities.

Web applications:

flickr.com

This one is the most obvious, flickr has a search option build in their starting page, simply enter a tag you would like to find and it displays the results as thumbnails with suggestions for related keywords. Pretty solid results and fast. They also have a advanced search. and a website that displays popular tags.

Associator

Enter a tag and associated tags are displayed.

Flickr random photo browser

Displays six random images every time the page is reloaded.

Lightweight flickr Viewer

Postcard Browser

From the same website as the related tag browser, makes the images look like postcards.

Related tag browser

They are hosting the flickr related tag browser, you enter a search term, click go and you see a thumbnailed results page with related tags forming a circle around them. Nice flash site.

Plugins, Extensions and Bookmarklets:

Flickrfox

A Firefox extension that lets you browse your photostreams in the firefox sidebar.

Flickr Multi-Tag Search Bookmarklets

Search for any or all of the tags you enter using this fine bookmarklet.

Flickr search plugin for Firefox

This is a simple search plugin for your Firefox browser, that allows you to quickly search the public available Flickr tags.

Greasemonkey scripts

Great comprehensive listing of greasemonkey flickr scripts.

Search Plugin:Flickr

Mozilla Search Plugins for Flickr, find people, find tags, find groups and find help are available.

External Tools:

Flickr Auto Downloader

Download photos from specified user or interesting photos, specify size and location to save them. Neat freeware tool for windows.

FlickrDown

Requires Net 2.0, specify a username, tool displays all images and option to download them.

Flickr Explorer

Sourceforge project, photo mass downloader.

Flickr Screensaver

Requires net 1.1., changes your screensavers image with flickr images every 15 seconds.

Flickr Wallpapers

Changes your wallpaper with photos from the flickr website using tags you specified.