One of the most compelling new features of Mac OS X 10.4 was the Spotlight technology-or the ability to search the contents of any file, anywhere on your hard drive and have the results come up instantaneously in a search. Spotlight is still an indispensable tool to many, and it's no wonder that a similar feature is now available for Linux in the form of the Kat Desktop Search Environment (http://kat.mandriva.com/).
Kat, like Spotlight, is a system of indexing a directory or drive and putting all the metadata, fulltext, mime-types, and thumbnails from a variety of file types (including HTML, PDF, OpenOffice.org documents, Microsoft Office documents, MP3 files, and more) into a database. This information is stored in an embedded SQLite3 database from which the data is then retrieved, and it also re-indexes files as required (on change, move, deletion, etc.).
Kat is quite simple to use.