At Business Agility we use a lot of VMware virtual machines for development and testing of new technologies. This proves to be a quick way for team members to get up and running on a project, simply copying over the VM and they have everything ready to go.
Now although the VMware Player can be downloaded freely from the WMware site, you need to purchase something like the Workstation edition to create the VMs - or so I thought until a colleague pointed me in the direction of easyvmx. Here you can enter some simple parameters, such as the amount of memory and disk space your VM should have. Then the site will generate the empty VM, which you can download (4k zip!) and install your OS into. So far I am very impressed with the solution - more to come. Thanks easyvmx!