Resources

Mandolincafe: All about mandolins, mandolin music and mandolin players.
Italian Mandolin Federation: Official site of Federazione Mandolinistica Italiana.
Bundes Deutscher Zupfmusiker: All about different plucked strings, players, contests and festivals.
Homepage of Katsia Prakopchyk: Here you can listen to mandolin music, for example the "Sonata Prima" by Dario Castello.

Downloadable Music Sheets
Shopping Sheet Music
Music for the Nation: American sheet music archive.
National Library of Australia: Australian sheet music archive.
University of Washington Libraries Digital Collections: Pacific Northwest Sheet Music Collection This collection contains historical sheet music from and about Washington State, the Pacific Northwest and the University of Washington.
Historic American Sheet Music: Digital images of 3042 pieces of sheet music published in the United States between 1850 and 1920.
The European Library: Digital images of the most important pieces of sheet music published in Europe, free access.