This MBA is excellent, but if you're considering it and you haven't already done so, you should go to the macrumors MBA forum. Installing an Ubuntu 10.10 ISO image inside VirtualBox is simple, yet even when the VM is paused, top reports that VirtualBox is still sucking on 1.3% of a CPU. Not sure what's going on there, but it's the same for my Mac Mini. VMs consistenly run at over 6% whether or not X is running.