Good thread. Yep, Federer served BY FAR the worst he's ever served in a major final in the 2009 AO. No question. Not only was it his worst %, but he was spinning a lot of them in (as NYCtennisfan pointed out) and he wasn't hitting the corners much either.
Even with Federer choking terribly on his break points (YET AGAIN!!), I still have to believe he would've won this match (maybe even comfortably) if he had served as well as he usually does.
It is, alas, like Fed said himself, that he kind-of handed over the match to Nadal, due to his own errors, inabilities and mental inaptitude. At least I still think that was for 85% the cause of this loss of his, as I also believe that his emotional breakdown during the trophy presentation was more caused by his realization that he failed so terribly all by HIMSELF rather than by his disappointment on the loss itself.
Disclaimer: Not at all saying that Nadal didn't deserve this victory. He fully did. Nadal kept his cool, and while not playing his best himself, he took his chances where Roger failed terribly.