Errrmmmm, Shadow, I hate to say it but POVRay had Metaballs before Amorphium was a twinkle in it's programmer's eye!! :-) They were called Blobs in those days (late 80's/early 90's - although POVRay is still going) and also were adjustable for force as well as diameter, both settings being fully animatable. Have to agree finding Nemo is awesome :-)

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.