Twitter Lists introduces a new feature that third party websites have been offering for a while. A comprehensive option to build a list of Twitter users on any subject. This can be a list of all students in business 101, a list of local politicians who use Twitter or a list of the world’s most popular thinkers.

The main benefit of this approach is that someone can access the public messages of all the Twitter users in that list from the Twitter Lists page. It is possible to subscribe to a Twitter list to receive the usual updates when someone on the list posts a new message.

To sum it up: Twitter Lists makes it easier to combine the messages of various Twitter users under one roof without having to filter through additional noise that is created by messages that they receive in their standard Twitter Account.

There is still one question to be answered: How can someone find the best lists without having to manually look at the pages of Twitter users? The answer, at least for lists of prominent Twitter users, is Listorious. The service maintains a list of (currently) 140 Twitter lists sorted in categories like media, news, marketing, health or finance.

This is a good starting point to find lists of prominent Twitter users like all verified NFL players who use Twitter, journalists who cover finance and business or thought leaders of this world. On the other hand; You won’t find your high-school’s teachers there.

That many features have its price though which observant users will notice after taking a look at the computer memory that the VoxOx processes uses. A little bit less than 100 Megabytes on Windows leaves surely some room for improvement.

The client is available for Windows and Macintosh with a Linux and mobile client in the making. The first step after installation is the account creation which is done easily in the interface. The program reminds the user that an email will be send for verification purposes. That message however seems to have been a leftover from the past because it was possible to login right after signing up to the service. An email was send but it did not contain a verification code but only information about the service itself.

A wizard will pop up after logging in that can guide the new user through adding accounts to the unified messaging software. It is possible to add AOL, ICQ, Yahoo, Google Talk, MSN or Jabber Instant Messaging accounts or other accounts such as Yahoo Email. Some of the options are grayed out which seems to suggest that these networks have not yet been implemented fully in the software.

The interface looks shiny and modern but poses a problem for users who like to change the sizes of their applications. The size of the application’s window cannot be reduced indefinitely which means that it will look huge on smaller monitors. It can be minimized though which reduces the memory usage tremendously as well.

The website and client are missing some vital information though, especially about pricing. There is no information whatsoever on costs for calls, text messaging or video conferencing. Business users should probably wait until those information are published on the developer’s website and in the client before they start evaluating the unified messaging software.