Here's my two cents.
Slowly, Davo is increasing the number of people on the site just by hosting all of his mods here. However, we need to help him. I can post up a redirection topic at SporeBase (And perhaps include you in the whole brotherhood shtick we've got going on with Spore Addict- even though they were hacked
) and guarantee a few new members, but I'm not sure that they will stay for long. Give them forum games, give them whatever you can think of. Story writing is good, poetry is good.
Generally a good rule of thumb is...
-Get something to sucker them in (I.E. Davo's mods)
-Keep the forum nice and friendly to keep them here
-Add a bunch of activities to keep them from being bored
-They will become addicted, and continue coming back.
Unless you guys have a problem with it, I'll post the redirection thread today,