I just saw this and this looks like fabulous project - better that beagle! http://digg.com/linux_unix/A_better_faster_desktop_search_for_Linux
I love beagle, but not the memory footprint it uses and updates for mono used to break beagle, and vice-versa. I hope that "tracker" gets in Fedora 7 - and FAST.
There is a fedora package so get it while it's hot! :)