DrawBingo
Another free bingo site where you can win prizes. The games come complete with tons of animated patterns, an easy to use interface, 4 cards to play, and chat with the ability to play sounds in chat.  You play for "draw credits" which you can enter in the prize draws to win prizes.  All you need to do is join and download the software to play and you're ready to go.

WinToday
Here's something a little different.  WinToday are the highest paying cash bar on the internet.  All you need to do is sign-up and login.  When you login, a small "cash bar" banner will pop up.  Keep that window open and surf anywhere else on the web you like, but watch the cash bar!  If you see a banner that says "YOU WIN!", then quickly click on the banner and you'll win the Daily Jackpot (usually around US$50.00) or you could win the Instant Jackpot - which at the time of adding this link was up to nearly US$33,500.00.

GoLoot
Play various games and enter contests to earn points which will put you in the running to win daily jackpots.  You can also check on your horoscope, read movie reviews and get the latest US lottery results here.

Jackpot King
Join Jackpot King, play free casino-type games (i.e. blackjack, slots, video poker, etc) and win "Bambles" to buy ballots to win big prizes.  The prizes are usually online casino cash that you can use to play at real casinos on the internet.

PrizeWinner
There are lots of games to play (and win on!) at this site, including action games, cards, puzzle, arcade, quiz & word games, and quick win games.  You can play for free and collect "Prize Bucks", which you can then use to shop for prizes. You can also pay to play here and win bigger amounts.  Also, some games are not open to free players.  However, there are still quite a variety of free games to choose from that will allow you to win prizes.