This site pays you by the hour whenever you have a open internet connection and an active browser window.

Soprano.com Top 50 Free Stuff Sites
This site lists the top 50 free stuff sites, based on visitors' votes, in order from most to least popular, and updated daily(???).
 

This pay-by-the-hour site isn't open yet, but they're taking pre-registrations. Great rates, some of the best I've seen.

I've got many more sites to link to this one, and more links will be added as I get time to add them.