MLB.com released their top 50 prospects for the 2011 season tonight, and Jameson Taillon rated 18th on the list. Taillon was the only Pirates prospect named to the list. You can see the full list here, and the write up of Taillon is here. The Pirates were one of 18 teams to have just one player in the top 50.
The Baseball America top 100 rankings has come out at the end of February during the last two years. I could see Taillon rated a little higher in that list, although I don’t think any other players in the system crack the top 50. As for the rest of the top 100, the contenders would be Stetson Allie, Luis Heredia, and Tony Sanchez.