Hello,
I work for Cakewalk, and I wanted to let you all know about a resource that we have created for musicians looking to take advantages of the benefits that x64 provides for music production.
On this page, you'll find links to many audio interfaces & MIDI devices that have native x64 drivers. You'll also find news relating to 64-bit computing and music production.
Check it out here: http://www.cakewalk.com/x64/