The WordPress Help Cheat Sheet: Is a nifty little collection of code snippets and helpful bits of information aimed directly towards theme and template developers who need a reminder once in a while. Nice to print out and put somewhere handy. If you get lost looking for the link to the actual PDF download, look for it at the bottom of the post, towards the right under the word link. (yes, the authors need to make the most important content of a post easily visible and identifiable)
Thanks for the link to the cheat sheet! It is incredibly helpful to have this information in a quick reference PDF format.