[Zope] ZCrawler?

Does anyone know whether there's a Zope product or combination of products that could be used to create a full text search index on a given category of the Open Directory Project (ODP/DMOZ)? Say, if I have a web site dedicated to Garden Gnomes, is there some way that I could index every site listed in the Garden Gnomes category at ODP and provide a search interface for my visitors? I suppose I could settle for what ODP does already, but text searching would be cooler.