It looks like Bloglines is well and truly losing active users. My blog has about 500 subscribers in Google Reader and about 460 in Bloglines. So Bloglines is already behind the upstart. But how many of those 460 Bloglines subscribers are even reading anymore?
Four months ago I encouraged everyone to switch from RSS to my atom feed. About 45% of all my subscribers have switched. 40% of Google Reader subscribers have switched. But only 5% of Bloglines subscribers have.
My guess is there's a lot of stagnant Bloglines accounts that don't actually read those feeds anymore and would never do anything as active as switch subscriptions. That's too bad; Bloglines was really innovative at one time. Google Reader is awesome, I just wish it had some serious competition.