Spotlight Improvements In Leopard
Mac OS X 10.5 Leopard is set to feature several new enhancements to Spotlight, Apple's desktop search, and ComputerWorld outlines them. The improvements include searching across multiple networked Macs, parental search snooping, server Spotlight indexing, boolean search, better application launching (sorely needed), and quick-look previews.
The first "live query" desktop search that made it beyond proof-of-concept was in BeOS, made possible by a ground-up rewrite of the file system which blessed BeOS with (in the words of BeOS's lead file system engineer) "database-like" features, though I can't remember exactly which version of BeOS BFS first appeared in.
Google Desktop Search, MSN Desktop Search, Beagle, Tracker (no, not the BeOS file manager), Apple's Spotlight, the Start menu search box in Vista and to a large extent Microsoft's never-ready WinFS next generation file system all borrow extensively from BeOS's original implementation.
Not entirely coincidentally, the principal developer of BFS Dominic Giampaolo now works for Apple as a file system engineer.