I’ve been experimenting with AdSense%3Fai%3DBx0a64hMDRsKoF5eOowLL3ODNAYXP5ifB6ZaEAsWNtwEAEAEgnq-dBjgBUI3dibMBYMme2Ifoo6AVmAHnc5gB8oYBmAHchwGYAbiSBpgBu5IGmAG-kgagAZeVyP0DsgERd3d3Lmt5bGVzY292ZS5jb23IAQLaARlodHRwOi8vd3d3Lmt5bGVzY292ZS5jb20vgAIBqAMD&ai=BrWHe4hMDRsKoF5eOowLL3ODNAYXP5ifB6ZaEAsWNtwEAEAEgnq-dBjgBUI67k9EEYMme2Ifoo6AVmAHnc5gB8oYBmAHchwGYAbiSBpgBu5IGmAG-kgagAZeVyP0DsgERd3d3Lmt5bGVzY292ZS5jb23IAQLaARlodHRwOi8vd3d3Lmt5bGVzY292ZS5jb20vgAIBqAMD”>Google AdSense and ad placement for a few months now, since switching to Wordpress.  I’ve gotten some great help from advertisement/SEO guru Garry Conn which has definitely improved things my CTR.
I also ran across a nice article called Google AdSense:  Facts, FAQs, and Tools, which does a great job of covering how Google AdSense works.  In the article the cover several topics, including Things You Probably Didn’t Know About Google AdSense, Google’s Information and Tools, Google AdSense Tools and Services, and Google AdSense Tips and Resources.

I don’t think you can rely on Google Adsense as your blogs primary income, but it is great for a little bit of supplement income if you have proper ad placement.  I have had a great deal of success using Text Link Ads as well.  What ad services do you use?