Tracker Search Tool is a GTK-based GUI for Tracker. Tracker is a tool designed to extract information & meta-data about your personal data so that it can be searched easily and quickly. See http://projects.gnome.org/tracker/ for Supported data sources. With Tracker you no longer have to remember where your files are. To locate a file you only need to remember something about it, such as a word in the document or the artist of the song. This is because as well as searching for files in the traditional way, by name and location, Tracker searches files' contents and metadata.
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With version 0.7 Tracker (the indexer, daemon etc not just the Search Tool which is the UI) is moving to a more semantic rdf ontology of acting as a store and retrieval mechanism for other applications to use. Acting as a service this excellent desktop search client will then be able to join the underpinnings of a semantic desktop (e.g. GNOME 3.0) through interaction with Zeitgeist etc. So while, for now, Tracker is a fast, lean desktop search tool and file indexer the future should be very exciting.
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Takes a little time to index especially if you have a lot of small files. But once the indexing is complete, it is quite fast and shows relevant results.
Search anything easily and quickly. Excelent!