I'm still afraid to do x64 DC - just my luck I'd run into some utility or protocol or something that doesn't work on x64 and I'd need it.

Did run into that with a TS - tried to make a workaround but an old database running on TS x64 worked fine all week in testing so I put the box into production, the next day users were using some utility that I just could not get to run on the TS and finally had to go back to the x86 server.