This Python 2.3 (probably works on earlier versions too) scraps the list of registered ZeroConf/Bonjour services found at http://www.dns-sd.org/ServiceTypes.html and outputs (on stdout) the format in a more easily machine readible XML format.
This is used by iRoster to pre-populate the user’s preferences with a set of services.
Source: http://toxic-public.googlecode.com/svn/tags/BlogTag_20070927_729/ZeroConfServiceTypeScrapper
Sample XML output here: http://toxic-public.googlecode.com/svn/tags/BlogTag_20070927_729/ZeroConfServiceTypeScrapper/services.xml (sample contains full scrap of services as of 20050817)