In short, SwagBucks is a search engine you use for free. The big thing about SwagBucks is that as you search, you are awarded "SwagBucks", which you can trade in for Amazon gift cards, sports gear, electronics (Wii, anyone?), and so forth. I'm all about Amazon gift cards, so I signed up, and have found it really easy and fun to be a part of - and I'm about to cash in for my first gift card! Not bad, considering I was on vacation for a few weeks and missed a lot of "searching time"! Plus, there are other ways to win SwagBucks, and lots of people take that part uber-seriously, but I just use it for my regular, daily searching and have been accumulating SBs pretty steadily.
Anyhoo, here's a link if you'd like to join - I will get a few SwagBucks if you join through my link, which would make me most happy! More Amazon gift cards in the future! :-)
If you have questions, let me know! I'll post about my SwagBucks booty every once in a while, in case you have questions or want to sign up! :-)