PRESENT! Hehe.. I have a triple boot up on my Macbook Pro; OSX, Win7 and Gentoo Linux. Also I have a a Windows 7, Windows XP and Windows Server 2008 R2 virtual machines on OSX (via Parallels Desktop).
Why stick with just one when I can have the best of all worlds.. the native Win7 for the odd games that I play and don't work in OSX, the virtual Windows machines for AD etc administration practice, Gentoo just because I like Linux and OSX for everyday stuff and any serious work.