I haven't touched my PS3 in months either, not since I've been able to play on my PC again.
Just not enough PS3 games and not enough that have as much re-play-ability as Left 4 dead, Team Fortress 2 and COD4.
I mean 41 hours so far of Left 4 Dead without even trying the Survival or Verses campaigns and I haven't even gotten started on Left 4 Dead 2 yet. Team Fortress 2 is practically a whole new game every few months with new maps, patches and tweaks with more to come (polycount competition).
Oh and steam sales mean most of the games I've wanted to get in the past year I've gotten on PC for Steam. Oh and Good Old Games with their exponentially awesome line-ip of no-fuss-install classic games. Wow.