Anyone doing this on an MBPr? The only things I need to run on Windows will be fine on XP (and in fact a couple of them will only run on XP). So why not just have a Bootcamp XP partition that runs those bits and bobs, under parallels, and Steam and one or two other things? This will be a much smaller partition surely, being XP instead of Win7? And/or can I run two Bootcamp partitions, one with W7 and one with XP? It seems like a bit of overkill to run Win7 Ultimate 64-bit with a Virtual mode XP window in it, all in parallels in OSX, just to run one poky little XP program!