The 64-bit Windows audio phenomenon does seem to be for real. In addition to 64-bit music computers and 64-bit Cakewalk software, drivers are starting to surface. M-Audio already has 64-bit betas, and today Edirol announced it was launching beta drivers (via Harmony Central).

Of course, meanwhile on the Mac, in addition to the G5 Power Mac, we
have the upcoming Tiger release which should generally optimize all
processes running on 64-bit (G5) machines.

It's all proof positive that the forward march of performance hasn't
stopped. That's good, because as you know I like an insane number of
tracks and convolution reverbs on everything.