Rather than start another farm system thread, Fanhouse has us ranked 15th.
15. Washington Nationals | 2010 Rank: 16 | Players in Top 100: 4
They may have graduated Stephen Strasburg, but now they have another super prospect in Bryce Harper. That said, don't underestimate the lesser-known talents in their system like Sammy Solis, Danny Espinosa and Derek Norris. Washington's system is much more than one big-name prospect.
http://mlb.fanhouse.com/2011/02/10/2011-farm-system-rankings/?ncid=txtlnkusspor00000002Zack Greinke's Milwaukee Brewers are dead last.