A DigitalPoint Forums thread features a poll about the Google AdSense publishers' earnings for the year. It seems that most people have made between $500 and $2000.
Another DigitalPoint Forums thread has a lot more varied answers. Someone, for example, made less than $1. A few people made in the $200 or $300 range. Most people, however, really made under $1000.
Here is a quick poll where you can tell us how much you made with AdSense in 2007: