How to Find a File Looking Inside It - 2

Once I suggested Google-Desktop to search for documents contents. Now I will present two alternatives:

Beagle - http://beagle-project.org/Main_Page
sudo aptitude install beagle

Tracker - http://projects.gnome.org/tracker/
sudo aptitude install tracker-search-tool

Both are easier to install than Google-Desktop and has a nice look.

This is a Tracker screenshot: