Nogueira is a good guy. I always respected him as a fighter, but after seeing him on TUF 8, I definitely had a new found respect for him as a person. The guy was smart, humble, and extremely focused on helping his team. I personally wish I could have been a part of that just to get that kind of instruction from Nogueira.
I think his chances against Mir are pretty good. I just dont see what Frank Mir has in his arsenal to beat Nogueira, where as I clearly see ways for Nogueira to beat Mir, via KO and TKO.
I think Nogueira will be the "undisputed heavyweight champion" by the end of 2009... and it could be a little while before he loses the belt (probably only if the UFC signs Fedor)