Jared,
That 2000 active members rings a bell with me, too. I think that was the number of users active on at least a monthly basis. I may be wildly off, but for some reason, I have "300" stuck in my head for the number of members active on a weekly basis, or twice weekly basis, or maybe that was from a phone conversation with SilverFox who estimated that the core of the really active CPF members was something like 300.
Don't know. But I'd love to hear the actual figures.