I’ve been using Parallel’s Desktop for OS X since it was first available. I just got my upgrade to the latest version. One of the things this version includes is the ability for the Mac to have the C: of windows (when running in a virtual machine) shared to the Mac like any other shared drive.
It looks like Parallels really has a good handle on code resuse since they based it on MacFUSE (which is based on the ideas and API of Linux’s FUSE. Its great to see cool open source technology being used like this rather than companies reinventing the wheel. Anyway, that was my geek excitement of the morning.