Anyone noticed that we aren't getting anyone new that participates in the forums much?
That's seasonal, Duskling. Folks come and go, some remain for longer, some not. But generally there have been around 3-10 active users who have been constructively contributing to the forums discussion at any given time. It's not something one needs to worry about too much, methinks.
Those who do register, but lurk, may always come out of hiding one day- after all, not all have desire to participate- many like to simply observe, or others are just afraid of not being taken to. (Here is a great example of lurker turned active- Ertxiem was with us since 07, I believe, but only started posting actively in 09 or very late 08, if memory serves me right.)