Other than the news that IE9 wouldn't work on windows XP (vista and windows 7 only) I came across this article today at arstechnica talking about rendering speeds of IE9 as well as other features. It seems like microsoft is really pushing it with html5, along with other browsers like chrome, safari, etc. but this graph really caught my attention.
From the looks of it IE9 fares more favorably than Firefox 3.6.3 as well as Firefox 3.7. Firefox really should speed things up. I heard they don't even have jump list integration in windows 7 still. And on Mac OS X, it still doesn't have the "new window" option when you right click the icon on the dock (which safari and chrome both have). Hope firefox 3.7 comes out soon with faster rendering speeds, better system footprint and memory use, as well as smaller features like the ones I've mentioned.