I sold out last May and started putting Google Adsense ads on some of the older entries on this site. For the first couple of months I only got $0.29/day. In August it jumped up to about $1.07/day and this month it's $1.29/day (the increases were due to placing ads on more pages).

At $0.29/day having ad revenue is like getting a nice birthday present once a year: it's nice, but you're not really sure it's worth the effort. Once I broke $1/day it became much easier to match the revenue to the costs of running the site: $30/month matches well with Web hosting costs or can easily fund hardware upgrades. There's no profit in it, but it feels more self-sustaining.

I didn't sell out to make a profit, so this for me is a wild success. I still find it mind-boggling that anyone would pay me any money to read my old dreck, but I'm sure I can manage a happy maniacal laugh when I deposit my first check.