Roddick's 1st serve is the best. I might get flamed, but it's also the best serve of all time (yes better than sampras's first serve)
And how exactly is it better? Probably a few mph faster, but in every other area - spin, accuracy, disguise, ability to hit aces at will - its miles ahead. As for speed, when you take into account the difference in radar guns, its not that much. Sampras/Goran regulary hit 130's.
btw I'm suprised no one has mentioned Mark 'The Scud' Phillipousis! The man had a damn good serve.