For web service calls we want to be able to block misbehaving clients. Dave, can you look into how hard it would be to block clients in nginx, based on the User-Agent? We probably want to block a number of libraries from the start, we want applications to send a proper User-Agent for their application.

Related irc discussion:

http://chatlogs.musicbrainz.org/musicbrainz-devel/2010/2010-04/2010-04-26.html#T19-37-20-811255