Lately I've been searching the web for articles describing how to get the shot. While I have a basic understanding of how all the features on my 40D works, I don't always know the right combination to use. I found a cool article about how a baseball photographer pre-focuses with the AF-On button where he thinks the play will be; a bird article talking about ISO, focus points, and such.
These are the articles I find most interesting, not because they teach you something new about how to use the camera, but because they teach you a new technique to get the shot. Sometimes some camera geekery is required, but not always.
I've seen a couple on here, the waterfall and fireworks articles were good. Some more day to day examples might be interesting though.