Even though the current status is best gathered from bugzilla, I'll post a few teaser screenshots to whet your appetite.
Sending to Twitter/Twitpic
Sending to Flickr
The interface will see a "folks" based sending item called "Contacts" at the top of the sidebar, and we should see some more services and devices appear as well, as libsocialweb gains support for them, and old nautilus-sendto plugins are ported.
More when those pesky upstream bugs are fixed.