Some notes on how Google payments work -

http://www.seroundtable.com/archives/003486.html

Is Google getting ready for retail -

http://news.com.com/2061-10812_3-6050284.html?part=rss&tag=6050284&subj=news

Some additional notes on the Google Fraud Case -
http://www.clickz.com/experts/search/strat/article.php/3591851