The recursion might blow your mind.
Last week, a friend of mine needed me to do an audio file conversion, but the app that I use is installed on my windows partition. I really don’t ever boot into Windows unless I have a good reason for it — I’m much happier tooling around in Linux — there’s just something satisfying and comfortable about being able to pop open a shell at any time.
Anyways – it got me thinking: I’ve booted into a Windows XP image, why can’t I use VirtualBox to boot from a whole partition? Surely that is possible…
Tonight I finally got to play with it. And as you can see from the image here, I got success. 
It’s a little challenging, but it’s doable. I had to spend some time to iron out the kinks, but you can reap the benefits!
UPDATE: Sandeep has submitted screenshots with instructions on getting this to work with Windows 7, see below, at the very end.
UPDATE: If you are getting the error message: Offset must be a number: rce
I have found the fix for it. See the instructions below.
UPDATE: Bogdan (see comments) was able to get Windows Vista working under Virtualbox OSE, using the method below. See his comments for specifics on Windows Vista.
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