Paul Kedrosky has a good post on the latest trend that lowers the value of the Web, content farming:
Google has become a snake that too readily consumes its own keyword tail. Identify some words that show up in profitable searches — from appliances, to mesothelioma suits, to kayak lessons — churn out content cheaply and regularly, and you’re done. On the web, no-one knows you’re a content-grinder.
Via Michael Sippey.
Update: John Battelle has a more optimistic take.