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.
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.
