It's an interesting read, but I'm not sure "developers" is the right word. I can't say anything here was outside the realm of what a good front end developer should know, and if you're not a front end developer then you're probably not concerned with any of this anyways.

A developer should be the one spriting images and minimizing server requests, that's not a designers job. If they don't know how to handle photoshop then they need to learn. I would never hire a dev that could decipher a psd of a fw png.

Still a good set of information for beginners out there.