Well, I got my last achievement recently for beating hardcore mode, and honestly just kinda ran through that as quick as I could to finish it, leaving me with no characters that I wanted to play Old World Blues with.
So, I made a new character, and I am trying to stack him up as much as possible. I already have just about every rare weapon in the game, have killed 3/4 of the Legendary creatures, and been working on getting good skill points into everything, and am trying to go through and acquire every skill book in the Wasteland (might re-download Dead Money to get those ones as well).
Hopefully, I'll have maxed out just about everything by the time Old World Blues comes out, and it should make playing that interesting.
Anyone else working on a character, or doing anything interesting before OWB?