Steve, a robot drummer based on the MSA-T MIDI decoder, built by Texas Central Positronics.
Video here, here, and here:
Komega‘s MD24-based Musifore MIDI visualizer:
MIDISpeak / Speak & Spell controlled by Ableton Live. Video here and here:
A Yamaha CS01 with an installed CS01-MIDI kit, controlled by an x0xb0x:
The latest suitcase SK-1 from The Umbrella Company, with installed UMR for MIDI control: