performance tutorials?

[denise]

I'm really interested in learning more about what kind of performance things we need to keep in mind while coding, and how to design for a well-behaved high-availability web app. I know the very basics, like using memcache whenever possible and using direct assignments instead of shifts, but not much else!

So, is anyone interested in writing tutorials on things to keep in mind when coding stuff for performance factors? As we grow, this is going to start to be stuff we should keep in mind, and I think it's a great opportunity for us all to share knowledge and learn together. No matter how much you know, even if you think it's not much, it's probably more than someone else (ie, me) knows...