DSM 3.2 is currently in Beta and has a plethora of new features including:

– LDAP directory integration centralises account management, or transform your DiskStation into a LDAP based Directory Server
– New Package Center with an AppStore look and approach
– HTML5 and CSS3 Support!
– Mac OS X Lion and maintained Time Machine Support
– Virtual Drive allows you to mount multiple images directly from the DiskStation
– Photo Station 5, with improved social networking
– New Download Station which will allow you to download YouTube videos

More details on the Synology Website