There's been a lot written about virtualization recently. However, the traditional apps like VMWare and VirtualBox have always had the problems of speed and integration into the host. Luckily, there is another option: andLinux, a full-blown Ubuntu Gutsy-based distro that has been around for quite a while. andLinux utilizes the coLinux kernel, which is a port of the Linux kernel to Windows, which greatly improves speed (nice for those of us who only have 512 MB of RAM). Also, coLinux allows the VM and the host to share resources, while you have to virtualize all the resources in a "traditional" virtual machine offering.