I'm running both XP Home and XP Pro (SP3) with IE8 (on different machines!), and find it to be perfectly stable... I'm getting the annoying cross-site scripting message each time I open a thread, but it all works okay.

Maybe it's because I refused to accept any of the bells and whistles (compatibilty, change search provider and such) when I installed it... or I could just be lucky...!

I've looked at the others (Chrome, Firefox etc.) but couldn't see any reason to change... if it ain't broke, don't fix it.