IE9 Beta
A word of warning:
Don't do it :-)
I'm v.guilty of using all the latest technologies so a few weeks back I installed IE9 Beta.
Problems encountered:
MVC2 projects getting 404 a lot, I did see this discussed in an interview with Phil Haack and there was a debate on whether IE9 was just too fast for MVC2... do you buy it??
Also I've been having problems with the editor I use to write my blog posts, been using raw html as it just didn't work, tonight I tried compatibility mode and it works again :-)
What have I gained... nothing new that I'm using... until I get some time to run through HTML5 (on a month's holiday from work, wedding next week and putting final touches on the new house... time constraints ey!)