We're big fans of this model as well and have posted about it. But there are a couple things.

You don't have to download an application or anything for that matter. You just sign up and with a couple clicks you'll send the ads to your MySpace. You can also copy the code and embed the ads manually on your MySpace, Facebook, or blog.

The sponsors make donations to the charities based on views. So no clicking necessary. Any time anyone visits your MySpace, the charity is earning donations, and you are earning points. GOOD stuff, for sure.