VirtualBox
A few months ago I got into using virtualization software, which as it suggests, allows you to virtualize operating systems. First I started with a program known as VMware, which proved decent, but was lacking in one thing that annoyed me, it could not virtualize graphics card drivers so trying to use Ubuntu through VMware was pointless if I could not have my lovely Compiz effects which I adore in Ubuntu. This being a tragedy, I could not continue much with VMware. However to my joy, a few weeks laterI discovered that the newst version of VirtualBox, made by Sun Microsystems (the same as who own Java), allowed using up to 128 Megabytes of Video Memory for virtualization, which means I can now happily use UBuntu with the amazing Compiz effects. If you want more on compiz fusion effects please visit http://lifehacker.com/software/pretty-and-productive/power-up-your-linux-desktop-with-compiz-fusion-291002.php for a sampling. VirtualBox can virtualize most Operating Systems except unfortunately Mac OSX (though since I don’t prefer Mac anyway it is okay). For a list of Operating Systems that can be run through VirtualBOx please visit http://www.virtualbox.org/wiki/Guest_OSes.