I\'ve installed parallels desktop on my MacBook to be able to run Visual Studio 2008 in a XP installation. Everything works great except when I decided to put my websites in
Parallels uses network drives to simulate folders on OS X, and Windows can't monitor changes to network drives, so if you do this directly, it'll be broken.
If you want to keep them in sync though, use Live Mesh (http://www.mesh.com) and install it on both the host and guest. A little roundabout, but it'll make it so both copies are maintained (and Live Mesh is handy for other things too)