I am not a big fan of Barca team as such but they have proved to be a team with loads of abilities. With Puyol, Marques at the back, Xavi, Iniesta in the middle and Messi, Henry at the front-this team is full of talent.
Guardiola has been able to get the best of the players who have bags of abilities thus making him a 'special one'. Only concern, would be is to see that will he be able to replicate these achievements again like Ferguson or Daglish have accomplished.
Anyway taking nothing away, he has done in a year what managers would only dream to do in a lifetime in football!