I have been using IE7 on XP for a long time now. In fact the beta and RC releases where one of the first things I installed on my own PCs when I needed to rebuild them. Over time I got used to the new layout, and now I am hooked on the tabs, the integrated RSS (which syncs with my Outlook 2007 RSS folder) and oh yeah, it is more secure. Anyway, IE7 has been finalized for XP and 2003, both the x86 and x64 builds (as well as IA64 on 2003) and you can download the final release at the URL below!
Let us know what your favourite feature of IE7 is!