I did it, I converted from the blagg/ blosxom combo to Bloglines yesterday. A tiny awk script converted my blog list to OPML, and that was that. So far, so good, though Firefox seems to crash when the list of entries gets large.
I also wish that browsing the entries didn’t automatically mark them as all-read (side-effects on GET = bad!); a simple “done” button would be far better, I think.
I made my subscriptions public.