Anyone know who to make a sort of gooey affect (like water molecules in zero G), like the one seen in the Opalis demo? Nearest site decribing that affect is GLdruid however the executables don''t work.

I''ve never seen the Opalis demo, but I think I know what you''re talking about. You should do a search on "meta balls" or "blobs".

You might also want to search for the Marching Cubes Algorithm. It''s an algorithm for rendering meta balls.

Here is a gamasutra article about blobs.