I've just finished Bioshock on the PS3 and though it was great (I especially enjoyed the level 'Fort Frolic'). Though one thing I wasn't keen on was having to become a Big Daddy near the end (didn't quite catch the point of that).
I've actually owned this game since xmas '08 but never really bothered to play it until the following year.
Now that's finished I've started replaying the Resident Evil remake on the Gamecube and will probably start up a new PS3 game as well, maybe Valkyria Chronicles, another one of those games I've owned for a while and never really bothered playing. I seem to do this a lot, buy a game then leave on the shelf for a year.