On an intra Europe flight on Lufthansa the check in agent gave my GF and I a full set of three seats and said because of my gold status the middle seat would remain open. Not a published perk, maybe not even a LH perk but it certainly made me feel a bit special!

On Air Canada there are special seats reserved for their elites but apparently *G can snag them too. Unfortunately my Tango fare didn't come with seat selection...