Now, GPT sites aren't a bad thing. I actually have made decent money doing this, and there are alot of free offers also, but the key is to follow these tips:
1. Sign up for a separate email account on hotmail, yahoo, etc to complete these offers. Some of the companies that you complete the offer with will sell your email address and you will receive tons of spam.
2. Keep track of the offers you have completed. Two reasons for this...completing the offer multiple times for multiple GPT sites may result in being kicked out the GPT program. The companies that own these GPT sites alot of time own more than one...they'll notice if you keep completing the same offer over and over. And the second reason, if you sign up for a free trial that will charge you in a week or so, you want to cancel BEFORE you get charged.
3. Use a pre-paid Visa card (available at Wal-mart) to sign up for offers. This way they don't have your actual bank information.
4. Use an auto-fill program to fill in forms. It will save you a ton of time! Roboform is a good program, just search the web for it.
5. Always check the Better Business Bureau for information regarding the offer and complaints.
With a little caution, you can make money from GPT sites. I will be listing alot more GPT sites over the next couple of weeks. Just click "GPT" in the right hand column for reviews of all the ones I post. For now here is a review of Treasure Trooper, which is one of my favorite GPT sites:
Treasure Trooper
Minimum Payout: $20
Payout by Check or Paypal
Payment will be sent around 15th of month, any month your balance is over $20
