Can anybody comment how good is VirtualBox as compared to VMware and parallels. I tried it briefly( installed ubuntu and XP) and it seems good. It,s free, open source and small download( about 11 MB only versus 150 MB of VMware server and 20 MB of Parallels). The only main problem I encountered that on my widescreen laptop, the Virtual Machine was not really full screen. But I hope thy will improve it.