I do what most of the people above are talking about:
The daily $.15 daily; the daily email (you have to sign up for that); an occasional survey (also in the daily section) and the 30 posts/month for the Forum post. Gets me about $25-30 every 3-4 months. Not alot, but good for the effort required.
If you have a broadband connection, you can also try the daily videos (in the daily tasks section) and the daily game (in the Tinbu category of games). I have dial-up so those things don't work well with me.
If you want to do offers, check the Beginners Guide in the Support section of the forum.
And also check out the Promotions section -- there is a special Sunday and Tuesday bonus available during October -- but you have to be in the right place at the right time.