Ok so this game has more errors in it than the Indian restaurant up the street has cockroaches...Meaning a lot!
But it's still awesome :) And if you're willing to fix those errors, you're in for a good time waster.
Fallout: New Vegas - Lag, Crash Fix
The above is actually a compilation of MANY different game fixes for this release. It seems that NVIDIA users especially have problems with the game lagging / stuttering. Thankfully that is easy to fix. The next big problem is the game SAVES incorrectly (quick save and auto save simply do not function correctly). There are also audio issues for some people.
Anyway, just thought I'd post this since it seems to have helped a lot of people :)