If you still haven't tried the VirtualBox x86 virtualizer, now is really the time. I'm using it daily with multiple images (Windows XP, OpenSolaris, CentOS), and it's really super easy and very stable. Perfect virtualization for the desktop.
2.1.2 is a maintenance release, fixing and tuning a large number of issues on all hosts. VirtualBox is pre-packaged for all major Linux distributions, so this easy upgrade is just a couple of clicks away.