Dr. Drang helpfully reports his earnings from the iTunes Affiliate Program. I signed up for the IAP a couple of months ago and have earned a grand total of $2.23. Someday, I hope my blog can get enough traffic to reach the $24/month average that Dr. Drang has achieved!
At the moment, however, this blog gets about 1,000 monthly views—over half of which are due to a popular question on Stack Overflow that links to it. Guess I just gotta keep writing!