Invesp is giving away 400$ just for subscribing to their RSS feed.
The contest is pretty easy with a little twist. To get started, subscribe to their RSS feed. Sometime before the end of August they will post a secret word in their RSS feed. When you see the word you email it to email@example.com. One entry will be picked at random, that person will win 300$.
If the winner is a member of their mybloglog community that total goes up to 400$