Please put the link to the Stack Exchange directory page at the bottom of every SE site.
With increasing frequency I find myself wondering Where do I ask "Where do I ask ...?" ?. The stack exchange network is large enough that I don't know all the rooms, and new ones continue to be added. My question is already here in the form of Where should I ask "X"?, but I didn't locate that question, and the answer of "look in the directory" until after I'd spent 15 or 20 minutes searching for and composing my own question.
I did look at the short directory in the footer of every site first, but I know it's only a partial list, and being a big long non-alphabetized list of words it's hard to mentally parse.