I used Cyberduck on Mac OS X for quite a lot of tasks including talking to S3 buckets or even SFTP’ing into my Linux servers.
Every time I load up Cyberduck, I get flooded with Bonjour Growl notifications. Since I never use Bonjour with Cyberduck, I figured it’s acceptable to disable it. It’s a simple Terminal command, like so many other things are in the Mac world. To disable Bonjour, fire up Terminal and execute this command:
defaults write ch.sudo.cyberduck rendezvous.enable false
If you want to re-enable Bonjour, do the same command but change false to true.