I am after a simple W&B calculator for a PDA, with a few E6B
calculations (density altitude, say) but nothing else.

Try CoPilot, for the palm. It does more than just w&b, but you don't
have to use it. IT is outstandingly excellent though.

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.