Comparison of Pandora and Last.fm

An anonymous reader writes "Blogger Steve Krause takes an interesting look at how music recommenders Pandora and Last.fm work, including some algorithmic strengths and weaknesses. Although he seems to think Last.fm is better now, his punchline is that a combination of their approaches will eventually be the real winner and for that, Pandora can more easily become like Last.fm than the other way around."