Pedroia is more ready than Hanley, as previously stated. He's proven he can mash AA pitching. Give him the bump to AAA and let's see what he can do there. If he continues to rake at the ~.350/.450/.500 career line that he has, trade Bellhorn on July 31 and start the kid. Of course, this is assuming that Bellhorn reverts to 2003 and Pedroia is outstandingly excellent. I don't see it happening, but it is the most likely option.
Youkilis over Millar should also be fazed in. It'll give the kid more playing time, because he will be starting for this team in some capacity in '06 and maybe it forces Millar to start hitting. It's a win-win situation.