...But is it really worth another 60 dollars? As much as mods might change the game, paying 60 dollars for a game you already have is not worth it.
I don't know if it's worth it to the OP, but for me it was worth it. I've learned how to use the GECK (some of it anyway) and have spent countless hours modding as well as all of the hours playing (just got done playing some to come in and comment). And I'm still playing because the game is a lot tougher because I'm playing with mods like MMM (new version released today) that make it a lot tougher than vanilla so it's more interesting than it was after playing for over 1000 hours on the 360. And sure, I'm playing parts of the game that I've played countless times before, but they are still fun for me in part because of mods. Ok, I have to be honest, mostly because of the mods. All new clothes, modded weapons, taking screenshots, going to pick up modded companions, hunting up modded NPCs that weren't in the game before, new and expanded locations, etc. It's all fun and different, which is really the point. It adds more hours of enjoyment. All worth the money to me. I can spend $10 on lunch and I've spent way more time on FO3 with the PC than the equivalent of six lunches.