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.