There are already plenty of wp sites with the 'top 20 xxx' lists available, and frankly at least to me they get old.

What is really hard to find is sites that focus on the codebase itself. It could be something simple like little code snippets that do certain things, or preferably more advanced topics. I know for me at least, I would love to see articles that pick a particular topic within wordpress, like adding taxonomies, (Justin's movie database article is great at this). Where everyone that I have found falls short, is they do a basic article, and never expand on it. I for one would really love to see some very advanced cms concept code articles.