Prize Offers: You Don’t Have to Pay to Play!
http://www.ftc.gov/bcp/edu/pubs/consumer/telemarketing/tel17.shtm

excerpt from FTC CONSUMER ALERT
A Dozen Ways to Protect Yourself
The next time you get a "personal" letter or telephone call telling you "it’s your lucky day," the Federal Trade Commission encourages you to remember that:

1.  Legitimate sweepstakes don’t require you to pay or buy something to enter or improve your chances of winning, or to pay "taxes" or "shipping and handling charges" to get your prize.

If you have to pay to receive your "prize," it’s not a prize at all.

5.  It’s highly unlikely that you’ve won a "big" prize if your notification was mailed by bulk rate. Check the postmark on the envelope or postcard. Also be suspicious of telemarketers who say you’ve won a contest you can’t remember entering.

8.    It’s important to read any written solicitation you receive carefully. Pay particularly close attention to the fine print. Remember the old adage that "the devil is in the details."