I'll add that Metaball can be used for more then just organic modeling. The main body here was created using metaballs. I will admit, another application, but metaballs none the less. Some of the other pieces (helmet, turbine, etc.) are not metaballs, but the main shape is. By playing around with them, you can get some very neat shapes. My only problem is no solid preview while you're working. It doesn't show the interaction very well. :(

The doctor says I have way too much blood in my caffeine system.