Spotify for webOS is out, you still need a subscription to use it
Feature-wise, it's pretty much got everything you'd expect. You can search and browse through Spotify's catalog of millions of tracks, create, sync and edit playlists, view and play your friends' playlists, listen to offline-enabled playlists, wirelessly sync your local files to your phone, and share music via email, messaging and Facebook. As with the desktop version of Spotify, the webOS app also supports scrobbling to last.fm.
Spotify for webOS is a free download from the Palm App Catalog.