Natural shower that is... I've been using this baby in the pouring rain for a couple of days, along with the DA16-45 and Sigma 70-200/2.8 DG and the AF-540FGZ even, not a problem at all.
Now we all know that lenses are fairly weather resistant, but the flash really surprised me, but it was probably more luck than anything else with the flash not getting damaged after a full drenching.
I'm a bit busy, so sorry for my non-response in some of the threads I started and also, Joseph, I still gotta send you that pic of yours still...
Anyway, here's proof of what I've been saying:
Photo taken by Jack Simpson:
Cheers!
-Asad