Cornell Cooperative Extension has materials relative to silvopasture in the northeast on their website. Also included are power point presentations from the Northeast silvopasture conference held in Nov. 2011. Plenty of good materials there.
http://www2.dnr.cornell.edu/ext/info/pubs/index.htm
Also they have a 'ning' site, a forum about silvopasturing:
http://silvopasture.ning.com/
