I like close-up pictures of motherboards. Look at them hard enough and you can learn all sorta about the features and characteristics of the board, if not the actual model. Let's start with the bundle, however:
Checking out the backplane is pretty useful too...
Still, near the southbridge is often where most of the clues are at...
See if you can work out what it is, or let us know what you know about the board and explain why.