This one took a bit of reworking when the 2.0 beta bits came out, but it's all set now. One thing that was different in 2.0 is the inclusion of a content project, instead of just a folder, and the old sound content wouldn't load in the new project, so I had to regrab the files. If you crack open the audio.xap file, you'll see the Version number is 16 now.
One of the other snags I ran into, that may have been my own error, but took a while to figure out was that my content project was targeting an xbox instead of PC. Once I figured that out, everything ran fine.
Anyway, you can grab the Audio3D sample here.