All of these GPT(get-paid-to)sites are among the best-paying ones out there. There's always lots of promotions and contests to seriously increase your earnings. You won't get rich doing them, but they're a great source for some extra income involving minimal time & effort.

Blasting Offers- Top-paying offers and plenty of contests and promotions. Cash-out through PayPal, check or money order monthly.
http://www.blastingoffers.com/member...ref=winds7seas

Treasure Trooper- Fun site with treasure-hunting theme. Lots of contests, games and drawings where you can win some very respectable cash prizes. Pays monthly by PayPal or check.
http://www.treasuretrooper.com/352163

Girls Bazaar- Top-paying offers and lots of promotions and contests. Several payment options including PayPal, checks and money orders. Pays monthly.
http://www.girlsbazaar.com/members/r...ref=winds7seas

Cosmic Cash- Lots of great-paying offers, promotions and contests. Several payment options including PayPal, check and OboPay. Pays monthly.
http://cosmiccash.com/members/regist...ref=winds7seas

Uniqpaid- International site. Pays monthly by PayPal, E-Gold or check. Tons of well-paying offers. If you have website or blog you can also make money here through affiliate marketing. Post a few offers and get paid for it.
http://www.uniqpaid.com/cgi-bin/main...f&refid=372472

Race 4 Offers- This site has new owners that seem very professional. They're paying off the debt left by the previous owner and are determined to make this a top-notch site. Pays weekly by PayPal or check.
http://www.race4offers.com/members/r...ref=winds7seas

Squishy Cash- Lots and lots of promotions and contests. It's very easy to build up your earnings here very quickly! A really good site.
http://squishycash.com/members/regis...ref=winds7seas

-