While Spotify has had little trouble cranking up its subscriber base so far, one feature that has notably been lacking is its radio / auto playlist feature. Today (tied in with an appearance by CEO Daniel Ek at LeWeb 2011) that's been upgraded, as the freshest preview builds move the Radio section down among the new Spotify Apps, where it now lets you drop in any song from your library for it to automatically create a radio station of similar music around. Subscribers not interested in upgrading yet can find similar functionality tied to Spotify's library with the
