Here is the first one I made (I sold it back in May on Flippa.com for $350): http://www.techspyer.com/ I learned on this one that I needed to focus on content more than spammy affiliate links.

Here is an example of the content I paid someone in the Philippines to write: http://www.techspyer.com/tag/digital-camera/ (most of the tags have a "buying guide" at the top)

All of the "posts" are just coupon feeds from Linkshare's RSS feed. This site made $10-15 per month for a solid year. The total cost is as follows:

  Domain: $7.49 (GoDaddy)
  Hosting: Free (Unlimited accounts on Rackspace)
  Content: $24 - $2/article x 12 articles
  SEO: $10 in backlinks from SubmitEdge

The total income over 12 months was about $150. I assume the site would have continued to produce $10-15 per month indefinitely with no more effort on my part. I sold it for about 2x yearly earnings (I have no idea why the new owner hasn't activated his own Linkshare RSS feed).

For the other sites, I prefer to keep those private because they are in untapped niches and I don't want to invite competition, but for those I focused on content RSS feeds and AdSense instead of affiliate links and they make about the same amount of money per month.

I'm going to try to do some more of these sites...I keep telling myself that if I registered 1000 domains and put simple sites like these on them at $41 each, I could turn $41,000 into $10,000 - $15,000 per month. Of course the hard part is getting started.