More XP SP2 Info for Web Developers
This is an excellent document for changes in XP SP2 for Web developers.
Pay attention to the last section (General Tips), it shows how to figure the browser version from client side script.
The link: http://msdn.microsoft.com/security/default.aspx?pull=/library/en-us/dnwxp/html/xpsp2web.asp
Note: This way of browser version detection did not work when I tries it on XP SP2 RC1. It worked well on RC2 installed machine.