I've been asked a few times to write for or contribute to a site about WP. Each time, I wondered what I could write about, and then came to the following conclusion: - either write a "killer article", but then, why not publish it on my blog instead? - or write something I usually don't write about on my blog, like, newbie guide for configuring your blog or anything, but then, if I don't write about this usually or my blog, well, it's because I'm not interested in the subject, hence I don't want to spend time writing about it.