More articles, with more frequency. Also, really promoting the links sections, and getting the editors to work on them substantially, may help, since the community aspect doesn't seem to really draw people. Informed articles and informed sets of links may do more to attract people than the whole community thing. I've also noticed that you folks don't do a whole lot of promotion. Maybe there isn't anything wrong with S101, but rather that it hasn't had much promotion.
Word of mouth is always the best publicity.
I do see quite a few of my favourite sites bowing to the pressure and setting up Fire Walls to one degree or another. If S101 wants to become as big a site as GeoCities, for example, then you should consider offering members Home Page facilities, if only as an extension of the Profile principle. OK, this translates into hardware, and therefore cost, but I'd like to see GeoCities advertising income, and I hear there going public. I point a lot of people to S101, and I want them to know it's Canadian, so I have to tell them. I'm undergoing the same problem via my website.