The free version of Cognicube HD has received ~500 downloads per month for the last two months, and ~1400/mo for the two before that on the Android Market. It has been in-market since mid-November. I've sold 5 copies on Market, 6 on Amazon, and 106 on the Nook.

http://appsforartists.com/get_app/cognicube/

It's currently being featured by Sony on their Tablet line:

http://app.sel.sony.com/sonytablet/us/s/en/#cat-games-2/item...

Think of it as an experiment. If you make money, cool. If not, you created something people hopefully enjoy and have real data to explore the economics of the app economy.