08.31.46 - Mark
So it's late, you get bored, you have a little technology and next thing you know you've cloned yourself...
Actually I was helping a friend figure out how a photo was taken, and got sucked into the DIY approach. Fairly simple, take multiple photos of the subject, add each image to a new layer in Photoshop, align them, then mask off or erase unwanted background in each image (except the base image). Little more detail, and a lot of example can be found in this Flickr discussion thread. All I have to say is you have got to love the power of Photoshop.