Kupu works in Safari
Perhaps I've been living under a rock
I really had no idea, though. I'm using Safari 3.1.1 and Plone 3.1.1 (coincidence? I think not) and kupu seems to work just dandy, drawers and all. Here's an internal link, for instance.
Recursively speaking:

How lovely!

Previous:
Kupu in Safari

Almost there
The 2 drawers do come up, but then get stuck in a continuous wait mode, I left it on for some time, but nothing happens on my local plone 3.1.1 based site, so gave up.
Almost there though, everything else seems to work just fine. :)