I run adsense on the blog – it keeps a few pennies trickling in. All of the content is context driven.
I keep having to filter stuff I don’t care about – baby formula, dating agencies, a whole load of Chinese ads from when I was in Beijing. Newest one is ‘Mormon Ringtones’.
I had to filter out a whole list of puppy ads on my dog sites. I rescue! No buying puppies from puppy mills on my sites!