MasterKey is an interesting prototype of a new meta-search engine. I like search tools that generate metadata (in the form of subjects, authors, etc. to narrow one’s search) on the fly. Vivisimo was the first of these that I encountered, and MasterKey is an excellent example of how to do this in a usable manner.
One thing that needs to be addressed, however: once you have narrowed your search results, there doesn’t seem to be any straightforward way to go back to a broader set of results, short of modifying the info in the search box. One has to expect to be able to back up and explore other areas with as much ease as narrowing the search in the first place.
from Catalogablog
