You'd be surprised...

Using FREE... To make Money and a few other things...

Might get a few ideas in this thread...
http://www.sowpub.com/forum/showthread.php?p=17460

Make sure you read...
Chris Anderson, author of The Long Tail and the upcoming book “Free” defines the trend as “The Economics of Abundance and the Price of Zero”...

When it comes out (info in that thread)...

Phil