Web-based IM chat service Meebo allows you to log into multiple popular IM services AIM/ICQ, Yahoo! Messenger, Jabber/GTalk, and MSN Messenger, all at the same time. And to make things easier on you, you can do it all with one Meebo id, straight from your browser.
Meebo’s interface is nice, clean, and contains the Ajax-y goodness [...]

MagicAjax.NET is a free open-source framework, designed to make it easier and more intuitive for developers to integrate AJAX technology into their web pages, without replacing the ASP.NET controls and/or writing tons of javascript code. MagicAjax initially appeared as a codeproject article. Now it is hosted on Sourceforge and you can find the latest release [...]