Went looking for waterproof switches.  
Found this.
Autoswitch:
http://www.autoswitch.com/

Also, these are pretty nice:
http://www.trailtech.net/switches.html

Looking for a nice switch to turn off a $30 JC Whitney headlight modulator.  I may tie the autoswitch into my Flash-To-Pass trigger, or something.  
I'm adding auxiliary lights (twin PIAA 1100Xs) and an air horn later, though.  Have to figure out a clean switching solution.

Also, if you're interested -
Best auxiliary fuse block, in my opinion:
http://easternbeaver.com/Main/Products/Fuseboxes/PC-8/pc-8.html
2 unswitched circuits, 6 switched
60 amp total capacity
Better than the Centech, to me.  And the Painless is ugly.  
$65, though.  The Centech is only $50.  I love how much he charges for his relay kits.  

Edit:
On second thought - $30 for the modulator + $30 for an autoswitch = same price as a Diamond Star with an automatic shut-off.
Just gotta figure out where to mount the sensor eye on my Versys.  
Don't wanna drill any holes.  
The cheapo JC Whitney model will cause an illuminated switch to blink as a reminder - if I have to drill holes, anyway...
Might get annoying, though. 
I wonder if this is waterproof:  (It's green.   )
http://www.amazon.com/Hella-Flush-Mount-Rocker-Switch/dp/B000GKAZJ0/ref=pd_sbs_auto_4