For a while, I've been talking about Desktop Dipsy - a sort of natural language parsing shell that's useful for all the little one off things you want to do without dropping into another app. I've had these for a while but I figure I'd mention them now.
Of course, ideally it'd index my local data - sort of like a cross between
Beagle,
Yub Nub and the venerable
Infobot but with more smarts and a friendlier interface.