Make a Huge Printable Poster from Your iTunes Album Art!

Over at Instructables they have a detailed list on how to make a HUGE poster from your iTunes artwork, BUT you need a PC and a slew of software. Considering we have the smartest group of readers on the internet, I was wondering if someone could come up with a method to do this on the Mac. Anyone care to try? Mind you, the script must pull the artwork both downloaded from Apple and manually added by hand.
We were the first to get the MacOS to run on a PC, so this should be easy :)
