Open Web Messenger
http://openwebim.org/index.php

Open Web Messenger - http://openwebim.org/index.php

5 Great Instant Messenger Aggregators Across Multiple Platforms - http://mashable.com/2009/02/28/instant-messenger-aggregators/

Since the proliferation of the Internet, instant messaging (IMing from here on in) has become a very popular means of communicating on the Web. Even with the rapid growth of Twitter, many people still communicate using IM. Now, there is no shortage of IM protocols out there; these include ICQ, AIM, GTalkGtalkGtalk, Yahoo, and FacebookFacebookFacebook, to name a few. IM aggregators aim to solve the mess of having all these programs open at once. Here is where it gets complicated. Depending on whether you’re on the web, Windows, Mac, or a mobile device, there are a number of aggregators from which to choose. To help you figure things out, here are five great instant messenger aggregators for multiple platforms.

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Just what the title says. Mashable does it again.