Amazon Mechanical Turk - The online market place for work.
SerpClix - SerpClix is a click exchange network used to send more real clicks to your Google SERP. You can click to earn money or buy clicks to rank higher on Google.
CoinWorker - Complete tasks for bitcoin.
Spare5 - Earn money in your spare time with our free web and mobile apps.
Picoworkers - Earn money from doing short, easy tasks similar to Microworkers. Picoworkers is the best alternative to Microworkers I ever find.
Bitfortip - Tip Bitcoins as an incentive | Earn Bitcoins for being helpful