I'm stuck by the fact that AdSense has become the internet currency. Several startup sites I'm using lately incorporate AdSense into there business model. 

For some it appears AdSense is replacing venture capital and others it looks like a unit of measure for the venture capitalists. I can see the interview, "How much revenue have you generated from AdSense in the last 6 months?" The spreadsheets and chart displayed.

It is micropayments. There will be others. (Sure I'm not first to say this.)