is my guess too, but not Cicadellidae, as I think they would have spines along the hind tibiae.
This photo shows lots of detail that would never be captured by your standard off-the-shelf camera; the single small hair projecting from the knee joint on each leg, for example - normally visible only under a microscope, yet possibly a distinguishing character. That's what I like most about close-ups of very tiny bugs: there's so many new things to see.

I still haven't figured out what this is, but I think I have found even younger instars of this species on the same tree. I will try to post a picture of them soon, though I'll probably have to find an adult before an ID can be made.

As for taking closeups of tiny bugs, I must say that I've been sincerely motivated by your forum post calling for more images of tiny specimens :)