A complete overhaul of the iPod, iPad and iPhone support including solid support for device playlists (however, underlying library, libgpod, still doesn't support iOS 5 devices completely)
Transcoding for iPod-like and USB Mass Storage devices that complements transcoding for Local Collection
The Free Music Chart service is now activated by default
Embedded Cover support for Ogg and Flac files
Album Art support for tracks on the filesystem and USB Mass Storage devices
And of course numerous bug-fixes