I sent them an email, and cc'ed Greg Bildson. Here is the text:
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Dear Shareaza Developers:

Just wanted to point out that there is a Gnutella Developers Forum available here:

http://groups.yahoo.com/group/the_gdf

Also, I noticed that Shareaza allows for no limits on Ultrapeers. While allowing for massive searches, this type of behavior is not very beneficial for the network in general. LimeWire recommends a limit of 10 Ultrapeers and I would tend to agree. Even 10 is somewhat large, the query traffic is amplified by Ultrapeers since they create a high density network.

Sincerely,

Vincent Falco
Free Peers, Inc.