At first I revisited FO3, finally scooping up all the trophies/achievements I missed and building a "maxed stats" character. I've easily spent over 1000 hours on that game, but I've been laying off FO3 for the past month or so so FONV will feel "fresh" when I eventually play it.
I also re-started my GTA IV game. Only got as far as the bank heist mission, then they retroactively added Trophy support for the PS3 so I quit the game with the intention to replay it, and then FO3 came along and I shelved it. I'm almost back to the point where I left off, but I wound up yet getting another game...
So now I'm playing Dead Rising 2 for the PS3. I pre-ordered it through Gamestop to get the Ninja outfit bonus and it arrived late last week. For the most part the storyline is linear and all the missions are time based and there are quite a few tough "boss" type characters called psychopaths, non-zombie characters that have either gone crazy or are capitalizing and thriving on the chaos of the zombie outbreak.
The good part is that you can restart the game from a save which will carry over your characters progress into the next game, so the first time that you play you can totally ignore the main missions and just level grind your character by killing zombies and rescuing survivors and once the time runs out you can start on a new game and carry over your skills. You can also combine average weapons (about 50 or so weapon combos in the game) like a regular baseball bat and some nails and build a spiked bat, which will let you build more experience (called "Prestige Points" in the game) so you can level up faster and kill zombies a lot more gratuitously.

The ability to ignore the main quest allows the player to have a pseudo "free roam" where you can engage in some mindless zombie slaying fun... :flamethrower::shocking:
It's enough of a distraction for me that I'm no longer suffering from all of the FONV anticipation and I can patiently wait for the FONV launch on 10/19.
Does anyone else have an equally good FONV distraction that you would like to share with the rest of us?