SurveySaavy - One of the first paid survey companies. Nice two level referral program

MySurvey - Frequent paid surveys, random cash drawings, $1.50/referral. Very nice.

GomezPeers - Get paid, hourly, while you're not using your computer. Plus $1/referral.

HTMail - The original paid email company. Highest rates around.

ClickThru - Free traffic for webmasters and a very good paid visiting program for non webmasters.

CashBreak - Get paid to play a wide variety of games. Also pays $.50/referral.

AstroBingo - Online real money bingo. Free to start as they give you $5 cash to play with for joining.

InboxDollars - Very nice paid email program. 2 referral levels plus $5 to join and $5/referral.

SnapDollars - Get paid to read emails and participate in offers. $5 signup bonus, $5/referral.

1Percent - An "alternative" rewards program.