"With the extra bits, your RAMs won't have to work as hard."
Huh? Not true. I mean, that doesn't even make any sense...
The 64-bit platform won't perform any better than a 32-bit platform for 32-bit applications, with the exception of any OS API's that MSFT might have been able to tweak.
Driver support for the 64-bit platform, as Wall said, is still lacking.
However, you'll be able to take advantage of 64-bit apps when they come out. Since the proc can do 64-bit math, math-intensive applications (can you say 3D games) should get a performance boost. Sixty-four bit procs can also address more physical RAM than the 32-bit procs, but unless you're running >4GB RAM that probably doesn't matter to you.