Dave, as per your suggestion and encouragement, I have taken the plunge and signed up for Google AdSense. Now I've added it to my site and am getting some traffic and an occasional clickthrough. But I really don't understand the nuances between all the data shown in the report; can you walk me through the overview report in AdSense?
Actually, I'm going to cheat a bit with this answer and rather than include it here and risk the ominous "duplicate content" penalty on Google, I'm going to ask that you simply pop over to my Ask Dave Taylor blog and read all about:
How to read a Google AdSense Report