Great Spaceship Sacrifices.
this is good stuff. personally i think the Pegasus from Battlestar Galactica is the best. Simply because the whole episode was just plain fucking awesome. I mean, you're watching and you're thinking, "oh man how the hell are they getting out of this one?" and then Lee shows up and starts whooping Cylon ass. This was the same episode that had the Galactica entering the planet's atmosphere, launching fighters, and then hyperjumping a few hundred feet off the ground in a fit of TV badassery.
UPDATE: here you go. both scenes. god this was an awesome episode.