A month and a half ago, after being destroyed at home by the Broncos for their third consectutive loss, this team seemed like a trainwreck. Many on this board were able to see what was wrong, but I think we have to give credit to Harbaugh et al for making the changes necessary: shuffle the OL, shuck the OC.
I think we also have to cite the Ray Lewis retirement announcement. People questioned the timing of that, but I think it gave everyone a greater sense of urgency and inspiration. This team is just plain tough.