Meet the AxiDraw: a cool machine that can write and draw on any flat surface. It can write with your permanent markers and other pens. It pairs with your computer to write like a human. It can be used to write invitations, thank you notes, and anything else you can think of.
The AxiDraw comes with a mounting easel to hold paper, cards, and envelopes. The machines comes fully assembled. You can use open software to put it to use. Did we mention that it is developer friendly? More information is available here.