Customers
The cluster tree shows topics - fairly descriptive rather than the one-word form used at several metasearchers. The graph is done through Java - will be slower to load but is worth the wait in order to fine tune the search. Web 2.0 interface is effective. Tool does show source search engine for result (MSN, Google etc). It doesn't provide any controls on choice of engine, number of results, or an "advanced" search form. But that's fine - it's still impressive. PolyMeta is a keeper.