John Sickels lists the top 40 2011 MLB Draft prospects at SBNation.com. They're in alphabetical order, regrettably, but there's a note about each of them indicating where they're likely to be selected.
The Pirates, of course, have the top overall pick, and that's very likely to be UCLA pitcher Gerrit Cole. They don't pick again until No. 61. It's ridiculous that a team like the Pirates should have to wait for a team like the Rays to pick 143 times in between each Pirates pick. However, after the first and supplemental rounds on Monday, the Pirates' second-round pick is the first one on Tuesday. That gives the Bucs an advantage, because they'll have time to do their due diligence on any players who might have slipped. That's something like what they did last year with Stetson Allie, who was widely regarded as a first round pick. He somehow slipped into the second day, and the Pirates, who picked early on the second day, weren't caught off-guard. So this list will be worth returning to after the first day is over to see who might be left.
Anyway, here's Sickels' note on Cole:
Could go No. 1 overall despite erratic season, with 95-99 MPH heat, power slider, and excellent change. Volatile personality in high school but matured into hard worker with strong makeup. 6-8, 3.31 ERA, 119/24 K/BB in 114 innings. Target: Early first round.