Over at Fangraphs they did some interesting analysis of which teams do the best at building through the draft - posting the five team who got the most value (fWAR) out of players they have drafted since 2002. From #5 to #1: Rays, Brewers, Dodgers, Giants, Red Sox. I wasn't surprised to see the Sox on the list, but I was a little surprised they were #1, especially since "drafted since 2002" doesn't include Youkilis.
http://www.fangraphs.com/...-draft-best-of-the-best/
http://www.fangraphs.com/...-draft-best-of-the-best/