As for it being trouble to code for all the major platforms (gapman) it isn't hard once you get the hang of it, and learn how to code for all IE's down falls (boarders anyone?) it just takes practice and is easiest if you write the site while constantly
referring to all three platforms to check.
I didn't say it was hard for me, I have been doing it long enought where it isn't a problem for me. I was just saying it could be "difficult" in general to those that don't really understand.