Out of the gate, I'll mention taking a star off for the Linux issues. They're common, and I hear about them all the time.

Otherwise, this has been a very fast, very stable, very useful solution to me a web developer. I currently run several versions of Internet Explorer withing Windows XP using VirtualBox, as well as the debugging and coding tools which come with Office, and am very pleased with my experiences. The Guest Additions for switching between OS X and the host environment via hover state are excellent and also work quite well. Make this work with Linux, and it'll be a winner. Considering Sun is now owned by Oracle, who seems to love Linux, I'm surprised it hasn't happened already.