Other online games: Lotro and GW are installed on my rig currently. I started the dl to AoC now that it's F2P because I like the setting, and if STO ever goes F2P I'd dl it too for the same reason (I was in the original beta for both these games, but didn't want to subscribe). When GW2 releases I will definitely be taking an extended break from DDO to play it with my old guild there.
Offline games: I am such a slacker on these! Installed right now I have Dragon Age, Oblivion, and NWN2. I still haven't picked up DA2 but plan to at some point. I will be picking up Skyrim when it comes out.