There are two things that have slowed investigation of Windows 7 and 64-bit Terminal Services for many Enteprrises. Those two things are App-V not supporting Windows 7 (yes, I know Windows 7 isn't released yet) and the lack of support for 64-bit in App-V. Microsoft has released immediately (for MDOP customers) an App-V 4.5 CU1 release that works on Windows 7. In addition, they've announced that they'll be opening up the TAP for App-V 4.6 which will support 64-bit Windows (TS is the big use case here) in Q1 2009. I happen to have a customer that is running App-V 4.5 right now that is definitely looking forward to both of these things, so it's very exciting news.