It was a bit more work than it should have been, but I have successfully claimed my feed at Bloglines. The Bloglines claim process requires that you add an html comment to your page template and to your feed [via a post]. Modifying the page template was easy, but adding the comment to my feed was a little bit harder.
Simply adding a comment to a post created an html encoded comment in my feed. And Bloglines wasn’t accepting the encoded comment. It was easy enough to edit my static Radio Userland feed to include the un-encoded comment, but my dynamic Textpattern feed was a bit harder. I decided that the easiest solution was to temporarily create a static feed with the required comment.
Which means that I can now welcome readers of my old feed at Bloglines to my new Textpattern driven blog.