Here's another one:
http://homokaasu.org/rasterbator/
Essentially what you can do with this is import any phto, and increase it to any size. Say you want to cover a 10 X 10 wall with a shot of the Big G and a couple of Vipers in flight. you import the pic you want, plug in the dimensions you want, and it will print out your pic on regular paper like a puzzle. You just then have to put it together.
