What's Up- Side Down?

I have no idea what kind of lizard this is, but his visits have become frequent- ever since our neighbors put up a pool-- coincidence? No idea, but I thought this picture was too cute and detailed to pass up posting. Someday* I won't live in the desert and I'll appreciate all the wildlife pics I have. I'm going to try and post more of them on here so that when I make a book- all sorts of things will be recorded.
Anyone know what this is? I recognize it from my road runner book, but more than that-?