Using Bloglines Publisher Tools »
At long last, Bloglines has rolled out their Publisher Tools, which allow you to do nifty things like claim your feeds. Essentially, you go to your account page and start the claim process, which gives you a couple of HTML comments that you need to insert into your site to make sure that you control the feed. The Bloglines verifies that you do indeed control it. Unfortunately they don't really tell you how to do it, so it takes a bit of trial and error.
