I just did a fresh install of Leopard and Parallels 3.0 and I can say it SUCKS. I allocated 2GB of memory to the VM (4GB on machine) and it's still slow. I had NO problems with this on OS X 10.4 + Parallels 3.0 (actually it was EXTREMELY fast on my previous setup) but Leopard or Parallels just broke everything. It honestly seems like I'm using a machine with 64MB of RAM in it with HORRIBLE file I/O. Not to mention the fact that I need XP for certain programs. Ya'll need to put a fix to remedy this issue or your going to have some pissed off customers. PS I also have that drive mount failure and the networking issue has gone away by itself. Weird.