Forgive my ignorance, but what is Monome?
I thought it was some crazy looking drum/sample machine at first. Looks interesting though.

How does it tie in with processing?

it can be a drum machine or sampler but (part of) the beauty of the Monome is that it isn't really "anything" until you make something to interact with it or to control with it. (there is a MAX/MSP patch available from them that is what they are using in the demos) I found a Monome Lib for Processing on the Processing site so i was just playing around with it to start doing some visual things. In this case, "out"... "in" is proving to be fun too tho.

ohhyeah,, cool. I remember an article on the Monome. Looks fun.