NASA is having a tough time. I read in a paper that the shuttle has around 200 critical(moving) components while the SpaceShip One has around 20. It looks like a terrible nightmare for the managers at NASA, not to mention, Griffin's status, although i read that he is more stoic, showing little or no emotions. Hmm... Lets hope that this bloated vehicle finishes building ISS and retires as quickly as possible.
Some sources you can read about the space shuttle:
http://www.nasa.gov/returntoflight/main/ (the official site)
STS-114 is the current mission to send supplies to ISS. See here about it