WOW. Prior to reading this thread, I had not heard of VirtualBox (http://www.virtualbox.org/), but I have now tried it on my MacBook Pro (OS X 10.5.2, intel) and can say that it works perfectly with Ubuntu 8. Networking in flawless, host integration is perfect (video any size I want, accelerated, mouse integration, copy/paste, etc...), and it is wicked-fast. I have officially dumped Parallels in favor of VirtualBox. It is easier to install, works with the distros I need, and, oh... it's FREE. Listen up Parallels: you will lose lots of customers if you don't get your linux support together in a huge hurry.