In windows itself (explorer, ya know

), I really noticed a lot of speed increases (really fast reponse for WIN+E for example, browsing folders went really great!), but overall it kinda was a pain to get all the drivers to work. Most of the drivers still were in beta, so you end up with unstable and even time limited drivers (creative...*sigh*). Of course now that it's gone gold, the final drivers should pop up soon enough, but I'd suggest you stick around a bit longer before jumping to 64bit. Remember that most stuff like drivers, codecs, etc. won't work... Programs do work though

.