SMB, AFP, FTP, and NFS are tweakable, too. There’s a web-based file browser, as well.
The web station page can help the admin turn the DS-409+ into a secure web server, complete with personal web directories, PHP, and MySQL. A Dynamic DNS makes this even more of a reality, plus SSH administration, too (who in their right mind would enable Telnet for anything these days?).
Various media sharing services exist, too. UPnP sharing for PS3 and Xbox 360 is there, plus DAAP, more commonly known as iTunes sharing. The audio station enables the user to stream music from the device via the web, or playback on USB speakers. The latter is totally awesome.
The photo station enables a web site on the device which can show pictures from the media folders, and the download station acts as a BitTorrent client and web file getter. The surveillance station can stream MPEG4 video from an IP camera.
The backup features are key, too. The admin can look through past local backups, as well as back up remotely to any rsync server.
External device controls round out the interesting parts of the admin panel, including administration of USB and eSATA drives, USB printer, and a UPS.
A very cool feature is the search box at the bottom of the page directory. Don’t know what you’re looking for? Type and ye shall find.