With only 500 units ordered and 30 scheduled to ship on May 8th, it's clear the Enso zenPad won't blow up the world, but it's nice to see a startup make good on its promises. We've yet to receive one of the cheap Android tablets ourselves, but we do finally have proof they're on the way: Enso CEO Alberto Armandi just sent us an official, signed receipt for the purchase of 500 MID-560A tablet computers from OEM SMiT, along with a bank document proving they have been bought and (mostly) paid for. What happens now is threefold: The 250 bu