On my MacOS Lion Laptop, I concurrently run Fedora Linux, Windoze 7, WindowsXP, and Apple IIe.

They work VERY nicely together, all at the same time, and without fiddling with rebooting into the so-called Bootcamp environment. Multibooting a computer is so 1994.
Heh, a photo I shot of +Danny Sullivan's work space yesterday caused him to write up his experiences. I struggle keeping all these different platforms and OS's running as well as Danny has them running but I do appreciate Danny's approach to how he covers things and this is why.

Do you try to keep multiple platforms up and running and your skills up in all? How do you cope?
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