Baseball America has a great roundup of their top 20 minor league prospects from the Arizona League this season. At the very top of the heap is Royals 2007 pick Mike Montgomery.
A supplemental pick, Monty has immediately jumped into the Royals prospect list and ranks real close in the organizations "top lefthander" list with Danny Duffy.
Other prospects who made the BA list are:
8.) Tyler Sample (RHP)
10.) Yowill Espinal (SS)
13.) Jose Bonilla (C)