I’ve just finished upgrading from VirtualBox 1.6.4 to VirtualBox 2.0.2 and I must say that the VirtualBox team has really done a great job in version 2.0.2. I still haven’t tried new support of VirtualBox for 64 bit guest machines because I am using the 32-bit version of Ubuntu.
One of the more obvious improvements that I readily found is in the seamless mode. Seamless mode in Virtualbox allows you to integrate you guest machine’s desktop into the host machines desktop. When I was using version 1.6.4, seamless mode was not too useful since my Windows guest machine would simply hang up.