I set up a web dev blog in 2003, at ILoveJackDaniels.com, and after a few months of rubbish blogging starting doing free cheat sheets to download. At its peak, from AdSense and text link ads, it made about $1200 per month. I had to move domain (trademark heat), and moved to AddedBytes.com. Lost lots of traffic and links, unfortunately. Ad revenue dropped over time (around $100 at its lowest), and I recently ditched the text links and adsense to go with CarbonAds.