Ubuntu is running very sweetly in general under the VM. In full screen mode, it's hard to tell you're not running it natively, at least whilst browsing. Liking the new interface in Ubuntu. Looks much more mainstream and less geeky, which might help them build some market share.
This is kinda bizarre. I'm running Google Chrome on Ubuntu 10.04 LTS in a Virtual Machine (Parallels) on my Mac Book Pro and it's running significantly quicker over 3G on my Vodafone dongle than Google Chrome on the host machine using the same connection!