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Islandnet.com: The Gottfried Silbermann Legacy
Excellent site describing Silbermann's work on the organ as well as the development of the piano. Many interesting links to musical societies which also have musical worth.
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Silbermann Organ Listing
Great site! Has all the known Silbermann organs listed with condition and location. How vast his influence must have been!
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Baroque Music C Ds: Silbermann Organ Recordings.
This site gives a listing of CD's that have been recorded on organs throughout the world which are connected to Silbermann. Each CD listed has a description of the organ which is very interesting.