Starhawk [PS3] offers Dual Log-In. Is this a first?

Sony just put up a new Starhawk post on the Playstation Blog that talks about the ways of playing Starhawk with other people. The game had a split-screen option that lets each player log into his or her Playstation account:

Dual Log-In: Yes, two players can sign into on one PS3. You can sign in using your PSN ID on the same machine and retain the XP you earn at your friendís house. And you can still take that hard-earned XP home with you and apply it to your character there. Although, if youíre Player Two, you canít earn Trophies or character customizations (outfits, paint jobs, decals) as these are saved directly to the PS3. Itís not perfect, but itís way better than Warhawk where Player Two couldnít level up at all. You can play Co-op off-line as well, but no stats get recorded.

This is the first time I’ve heard of a game letting players log into two accounts on one console, but then I don’t follow multiplayer that much. So my title isn’t rhetorical: does anyone know if this is a first?

Also kind of refreshing to read “It’s not perfect…” in a post like this. Honesty…what a refreshing concept!