I have a theory, and this is only a theory:
Every site will start off with someone wanting to ask "What is a good book/blog/tutorial/resource to get started with
____current topic____" but those are just about the worst questions to actually ask on the site, because those are pretty much "shopping" questions, and those are not beneficial to the site.
They're great as FAQs, and if we need them as a blog entry, we can formulate one here that once the site decides it needs a blogoverflow blog, that it can be posted there, as a canonical resource.
But while they're great as FAQs, they suck as Q&A site questions. They will, by their very nature, become obsolete over time. There's always a better mousetrap, altho specific problems have very acute ways of being solved in general. So, I don't think those questions are on topic. Just my $0.02