I ran across this while looking for information on Lucene indexing.
It may be that I am confusing the skill of the author with the utility of the interface (which may be commonly available via other sources) but I was impressed enough that I wanted to point it out.
It does seem a bit pricey ($99 for two users) but on the other hand, developing good documentation is (should be) a team based task. This would be a good way to insure a common understanding of sequences of operations.
Are there similar tools you would recommend for team based activities?
Thinking that authoring a topic map is very much a team activity. From domain experts who vet content to UI experts who create and test interfaces to experts who load and maintain content servers and others.
Keeping a common sense of purpose and interdependence (team effort) goes a long way to a successful project conclusion.