That is an excellent question. Spreading the word most definitely is the easiest thing to do, and it DOES help! What helps even more is writing to gaming mags and ask for some Automation coverage... with one email you could potentially get info about the game to 10000s of people.
There are other ways too. If you are willing to help the game on a more practical basis (and not just toy around), you can apply for beta-testing whenever that opportunity is announced: we always need good people.

Then there is translation work... a massive task that can only be accomplished together with the community. We have a German version already, and very recently we started out on the Spanish translation.
Hmm, but basically that's it! ;(
/Killrob