[Sinapus]

I use those moons as a long-term investment as well. Build an atmospheric converter on one and wait till the atmosphere converts.
Then build a space yard and cargo facilities; or space yard, ship and fleet training center, and cargo facilities.

With advanced storage techniques, a tiny moon with a PSYIII and 5 CSFIII can build ships and hold as much cargo as a huge planet. It just won't be able to get the population bonus a huge planet can get.

(For added fun, adjust the setting of one of those moons in one of the systems and make its atmosphere be 'Any'... Then there's a chance you'll get a tiny moon with your atmosphere so you can do this early on in the game.)

Also, these moons can be Ice as well.

(I modified the systemtypes.txt file so there is a planet in the Standard 3 system with *4* moons. Fun, fun..)

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"What do -you- want?" "I'd like to live -just- long enough to be there when they cut off your head and stick it on a pike as a warning to the next ten generations that some favors come with too high a price. I would look up into your lifeless eyes and wave like this..." *waggle* "...can you and your associates arrange that for me, Mr. Morden?"