I just ran across this site today and I already love it!! You answer questions to build up your points. The more points you have the offers you qualify for and check out. One of the great things about Crowdtap is that 5% of all the money you earn automatically goes to a charity that you choose. Crowdtap also matches this 5% donation. When you cash out your earnings, you can choose to get an Amazon giftcard, or donate the entire amount! This is a quick and easy way to not only get some extra cash for yourself, but to raise money for your favorite charity at the same time! I choose the ASPCA for my charity.
They also have opportunities to sample products and leave reviews. If you love free stuff then this is definitely a place for you! So far I've already got a sample of Listerine on the way :) I can't wait til I open up more activities to see what I get next!