I like Bloglines, use all the time to keep up with 70+ feeds. As just a plain regular user on the outside I do have one concern, how does Bloglines make money? I certainly enjoy being able to use the service for free, but they are a business, so they have to make money some how. The presumption is advertising of course, hopefully in a way that wouldn’t be too distributive. Eric Peterson asked this same question of Mark Fletcher (CEO of Bloglines) and posted about Mark’s response, basically highly targeted advertising. If nothing else Bloglines knows a lot about my reading habits (at least for sites that have feeds), so they should be able to target ads pretty well.
To give credit, I found this via Jeremy, who linked to Greg who quoted some of Eric’s post.