In 1978 Universal Studios aired a new science fiction series called Battle Star Galactica. I was only 2 years old back then and therefore I saw Battlestar Galactica for the first time in 1983. It was the first scifi-series I ever saw (soon followed by Buck Rogers) and it's still IMHO the best I've ever seen.

The story:
The story begins in a star system, the Cyrannus system, where a human race has been fighting a war against the Cylons for almost a thousand yarn (= years). The Cylons are a mechanical race, created by a know extinct alien race, to conquer the Galaxy. Even though the original creators are gone, the Cylons continued their conquest. Know, a thousand yarn later, the Cylons appear to be willing to negotiate for peace. But then, at the peace conference, the Cylons strike without warning and destroy all of the human colonies. The surviving humans flee for the Cylons in what ever ship they can find, led by the only surviving Battlestar, the Galactica. Their only hope is to find the last surviving human colony, only known by ancient records, on the planet known as Earth.

Pictures from the show:
Index 1 - These pictures are randomly taken from several episodes.
Index 2 - Pictures I took from the three our pilot "Saga of a star world"

Highly detailed scans of the Battlestar Gallactica!
I while back I found a Battlestar Gallactica boardgame at a fleamarket. Although the game itself isn't very interesting, it has very nice picture of the Battlestar Gallactica on it. Below are scans of the picture in various sizes with various backgrounds. Now you can finally have good picture of the Battlestar Gallactica to use as Windows background!
Large, black background (size 2028x705, 644 kb)
Medium, original background (size 800x379, 265 kb)
Medium, black background (size 800x278, 109 kb)
Medium, black background with stars (size 800x600, 388 kb)
Medium, multiple battlestars with stars on the background (size 800x600, 389 kb)
 

Links to other Battlestar Galactica related sites:

Kobol - The oldest and largest BSG page on the web. It has the BSG FAQ and lost of other information, pictures, a
              marketplace, many links, etc., etc.

Robert Hanczyk's Battlestar Galactica page - Information about the BSG mailinglist and lots pictures (early sketches of the
                                                                     BSG!), fanfic, etc.

International Battlestar Galactica Fan Club  - A BSG Fanclub led by Richard Hatch (Apollo) himself! This page also has a
                                                                    large amount of links to other BSG sites on the net.

The Orange Squadron - Homepage of the Dutch Battlestar Galactica Fan Club.

And of course there are many more, most of which can be found on Kobol's links page or the International Battlestar Galactica Fan Club page.