just what good IS a gall bladder for?

Just what does the gall bladder do? Why do some people get to keep theirs when they have gall stones and others don't? This info is from http://www.chiff.com/health/disease/gallbladder.htm:

The gallbladder helps to process fats. It stores "gall bile," which is a substance that your body produces to break down fat during the digestive process. The gallbladder releases this substance in regulated amounts so the fat doesn't cause problems in your system. If the gallbladder gets diseased or if you develop an acute problem with gall stones, it can be removed. Many people have gallstones and don't even know it. Little stones made of bile salts or cholesterol form in the gallbladder. Until they begin to block ducts or irritate the gallbladder they cause no problems.

Since my stone is in the neck of the gall bladder (ask the SO, he was watching the sonogram screen), so that means the whole thing needs to go. There are really gross pictures at http://curezone.com/gallstones/default.asp, but don't look, Lucinda!!