If you’re interested in Digital SLR cameras like I am, you’ll find DigitalSLR.org to be of interest.
I think what’s most interesting is that the site was begun with a secondary goal besides to provide information about digital slrs. The second goal is to make money with Google’s banner ads system. My question is this: will we find more and more topic-specific web sites like this if banner ads start to really pay off like this?