64 bit Microsoft Mouse & Keyboard Drivers!
I tried out Windows Vista 64 on a machine for a while, but had need of a more stable system (I generally wait to self-host on OS'es until Beta 2). So I reinstalled XP64, and on a lark, checked. What do you know: http://www.microsoft.com/hardware has 64 bit drivers. I've since installed them on my home system, too, and love my Natural Ergonomic Keyboard 4000 with it's normal key layout, plus the nice additions of =, (, and ) near the numeric pad :-)