I came across this site in one of my Ebay groups. It is lots of fun if you get into it. The site is great because it is all free and you can play to earn points. They do not spam you with nonsense emails so no worries there. Here are the specifics:

When you sign up you get 1000 points. You play by selecting numbers or doing a quick pick style. Your numbers will be checked against the winning numbers. You could win points or even cash. After accumulating points, you can cash them into gift cards for great stores. Some store examples are Walmart, Bath and Body Works, Best Buy, and many more. You can also earn points by refering friends. Each time your referal joins you recieve 100 points.  When that referal plays 100 games you get another 400 points. On top of that, you get 10% of all prizes and points won by your referals. You even earn points on the referals that your friends refer! All this and it is free! Check it out. It really is lots of fun.

http://www.netwinner.com/?signupCode=hunneybunn001