LittleBigPlanet may still be in beta, but if you're willing to sort through some boring bits, you can find a ton of great levels. Take, for instance, this monster that showed up on YouTube: the user has created a working electronic calculator using the game's level editor. If you don't think that's impressive, be sure to watch the entire video.

He claims the calculator uses:

610 magnetic switches

500 wires

430 pistons

70 emitters

and other stuff

I have only two things to add: this is pretty impressive, and this gamer has an incredible amount of time on his or her hands. Now I just want the full version to come out to see what everyone else can do.

Thanks to serversurfer for the tip.