I agree with everything Sean said. However, sticky posts may not have the desired effect. Mod_rewrite is in the user guide. People who don’t read that and don’t search, probably won’t go looking for stickied threads.
The one rule I’ve been trying to follow, is that if I can’t comment positively on thread, I don’t comment at all. Occassionally I slip up, but it’s something to strive for. The community is CodeIgniter’s biggest asset, it would be very sad to see it fall apart because prospective members are scared off by plain rudeness.
One thing I could see as helpful is a ‘How to Post’ or ‘How to get help’ announcement, like the one in the bug reports forum. There are far too many posts where you have to ask for a reduced code sample, the error message, or the 404 page (ci vs server). Heck, I would be willing to write it if no one else is.