I would agree with that picture. In other comments on this thread, I've indicated Java & SQL are the #1 demands on any project I've ever worked on.

At the same time though, none of those people have earned anything remotely what I tend to see on HN in general, and SF area in particular. From my limited experience, it feels like a good, experienced, hardened, senior Java developer in Toronto, Canada (not a tiny/cheap place), makes about half what a hot-startup-technology intermediate makes in SF :-\