I'll take this opportunity to say I think it's probably normal for posts/nodes in a knowledge network like this to spike quickly (as word about the site gets around) and then taper slowly off to a consistent lower rate. So many things have been said so well here that many threads become a discussion of which past threads make the best examples for a particular situation. Searching PerlMonks probably accounts for a great many answers that in 2002 would have required a fresh post.
in reply to Top level node creation trend update
That recently we've seen an upward trend since about November and perhaps August (month over month and year over year) is a promising sign. However, I think that we slowed somewhat in posts from 2002 to 2006 isn't a drastic problem.