Two SSDs in a Macbook Pro with OSX on one and Windows 7 on the other
If you use a conversion kit to fit the second SSD into the optical drive bay there is no reason why this shouldn't work. Personally I equipped my MBP late 2009 with a HD and a SSD (which ran dual boot some time ago) using Optibay Conversion Kit, but there might be cheaper ones on eBay.