Best way to humanely eliminate nuisance feral cats killing everything that moves?

Hmmm.... in this economy maybe it's time someone should consider cat ranching (or farming) as an industry. Maybe with a little outside the box marketing savvy a U.S. based cat meat company could open a new export product to 100's of thousands of hungry people in China. If you run with this idea I demand nothing less than a position as company vice president, company car and expense account. Have your people call my people.....