"rePatcher is an Arduino shield that allows you to “repatch” your Max/MSP or Pure Data patches with a 6 x 6 patchbay matrix. It also has 6 general purpose control knobs for modifying parameters in your patch. Since it does all of this over USB, it can be hacked to work with any other program that can accept a serial stream." Oh, very nice.

"cv.jit is a collection of max/msp/jitter tools for computer vision applications." Yasser just showed me these - very impressive, and quite simple, really.