Firefly

Just found a good western sci-fi tv series called FIREFLY.
Found out about this after I have seen Serenity the movie (2005, imdb).
Serenity was the name of their ship, it is a firefly class transport (small frigate).

Summer Glau, the terminator sent to protect John in Terminator: The Sarah Connor Chronicles, also stars in this series and in the movie as River Tam.