After I moved to my new house, My friend Younus gave me a nice gift, A DESKTOP computer with 22 Benq LCD monitor.
That machine is Giant!!, Windows7, 4 GB. so this took my to decide to use VirtualBox from Sun. It’s amazing. one of the most important points it gives you a tool to install it in the virtualized OS which gives you a chance to mix the two desktop ( for example your Windows7 desktop icons + Ubuntu desktop under VirtualBox ) you can do that by accessing one of the menus ( Install Guest Addons ) then try to choose the option of mixing the two desktop (called seemless mode)…..

I have an icon on the desktop for my SH, and you see two task bars one is down which is my Windows7 one. and the other is up which is Ubuntu.
the interesting part, it understands the virtualization hardware instruction in your CPU if you got either dual or quad cores, which leads you not to feel like you are running your OS under virtualization.