[robomartin]

Aren't you just angry because your girlfriend keeps seeing that penile enlargement ad every time she uses your computer? It sure bothers me!

All kidding aside, I'd say that the minute you start paying for Google's search engine, email, docs and other services you are automatically entitled to them blocking ads from AdSense-powered sites. Until then I can't see how someone can complain given the value received. Fair trade.