Seems there is a market for such a thing. EpicWin is an RPG to-do list application for the iPhone. http://www.epicwinapp.com

I take it you didn't see Chris Hecker's GDC talk? It was all about the real world gaining these MMO like rewards. It was fascinating and horrifying at the same time, but I'm hoping it will never be a reality.

www.gamasutra.com/view/news/27646/GDC_Heckers_Nightmare_Scenario__A_Future_Of_Rewarding_Players_For_Dull_Tasks.php