Rick Gosselin of The Dallas Morning News is mentioned here frequently, as he does an excellent job of covering the NFL  generally and special teams play in particular through his end of season ranking of each special teams unit. 

In his regular column this week, Gosselin previews the 2011 NFL Draft for specialists and includes two snappers.  Gosselin, based on his sources, has ranked Andrew Schulze (Iowa) and Zach Enyeart (Washington State) as the top snappers for the Draft in April.