Next Mac OS X to be Metadata-driven? "The (unconfirmed) info says that Mac OS X 10.4 will go "further than anticipated", introducing not only a "database-driven" new Finder (possibly similar to BeOS' Tracker) --although the file system itself will still be HFS+-- but also a wide support for file metadata. Please note that both the BeFS (and quite possibly this Apple implementation) is not similar to Longhorn's WinFS (apples & oranges). All this is not a surprise for us, as the people who were behind the same realization on BeOS --Dominic Giampaolo and Pavel Cisler-- today work at key positions at Apple Computer in the file system and Finder areas respectively."
I had previously mentioned another suggestion for metadata in OS X.