The folks over at iFixit have taken apart a Nikon D5100 and splayed its innards on a table for our viewing pleasure:
I'm not sure if I should be excited by this or creeped out. It kind of reminds me of the dolls from Season One of Dexter. Anyone else watch that? Anyway, if you've ever wondered what's involved in taking a Nikon DSLR apart, they show you how to do it step by step.
Speaking of the Nikon D5100, it's now been reviewed at quite a few places, and everyone pretty much agrees that it's another solid camera. Honestly, this isn't a surprise. I believe we've past the point of diminished returns with DSRLs-- sure, they keep getting incrementally better, but they already exceeded most consumer needs with the previous generation. It's smooth sailing from here.