The ones I use are:
Websites:
Swagbucks, Zoombucks, Irazoo, Bing Rewards, E-Rewards, CantBeatFree, Mypoints, Squidoo, Superpoints, 4Loot, Gifthulk, Inbox Dollars, Cloud Crowd, eBates, MrRebate & FatWallet
Android/iPhone Apps:
Jingit, Checkpoints, Shopkicks, WeReward, Locately, MobiRewards, Viggle, BambooWallet, AppDog, OnGo Surveys, Pepsi Loot, Juno Wallet, iPinion, App Nana, iPoints, Wikets, Field Agent, App Trailers, Offer Rewards, FreeAppDaily, AppRedeem, TapJoy, iPoll, AppJoy, Gigwalk, Surveys On The Go, Survey.com Mobile, thumbspeak, Staree
Facebook:
Plink, EmbeePay