Updated 2011-12-02 21:15 UTC – Stable Quality
Free & Open Source license
Automatic download of subs from opensubtitles.org
Just point at any video file and choose the subtitles you need.
Behind the scenes it’s nautilus script, written by Carlos Acedo and ported to maemo by int_ua.
This script can be executed from command line with a single argument – filename.
And still should be usable on your desktop with python-gtk.