Triple Boot 2010 Macbook Pro with Dual Drive
Save yourself a lot of pain (and time) by using virtual machines. VMware Fusion is $50 and lets you run multiple Mac OS, multiple Windows OS, linux, DOS etc. all at the same time.

I do web development, so I need to use Internet Exploder in 4 different versions. I can't do that on one boot, but I can have 3 instances of windows open at once. My job would take a LOT longer if I had to multi-boot my machine.