I *think* I've seen PKM referred to by Microsoft as "Publishing and Knowledge Management," or something similar to that, and that MSSearch is part of Microsoft's PKM initiative.  So I guess that would mean (or *might* mean?) that the full-text indexing in SQL Server is part of Microsoft's PKM initiative.

If this isn't right, do I at least get points for a credible, albeit utterly wild, guess? 

Chris