In one league i took Zimm instead of Fielder. Fortunately that was my only big regret in that league since I'm sitting in first place right now. But as for my other league...took Crawford over M-Cab, Pedroia over Lincecum, Morneau over Phillips, oh and I drafted Liriano
Pedro Alvarez and Mat Latos, mostly. I've been pretty lucky overall though. Most of my bad picks were closers that shat the bed like Lyon and Franklin, but they were relatively late picks. 3 leagues I'm currently in first place, the other two... not so much.
Fortunately not too many redraft picks I would do over right now. Vazquez was a big one as he was my 3rd starter on my 30 teamer. I just traded him, essentially for Brian Duensing. I figured Vazquez is one start away from losing his job, and in a 30-teamer there are no replacements on the WW.
Other than that, on the same team Reynolds, Markakis, and A. Jackson have under-performed, but somehow I am still 4-2 and in first place in my division. These guys are bound to heat up, or already have.
In my other redraft, most of my failed players have come near the end of the draft, so it's really not a big deal. That team also has Bautista, Braun, and Joyce on it, so I am doing pretty good.
Jason Heyward. so much potential. last year he had .272 AVG, 18 HR, 72 RBI, 11 SB in 142 games. I drafted this guy in the 4th round, thinking/hoping he could be this years Carlos Gonzalez and explode into 1st round value.