I've seen a lot of corrosion on old wires that did not have dielectric used. In one case on my friends '87 there was no way to get the wire off the coil, and it had to be replaced.
http://forums.pelicanparts.com/porsche-911-technical-forum/1127313-ignition-coil-wire.html
I use a light dab of dielectric grease on the ends. If not installed carefully with a firm push, air can get trapped and the boot will tend to push off.
As far as anti seize, Porsche recommends it, here's a TSB. I use NGK spark plugs, and they don't recommend anything when new. According to the website, the threads on NGK's spark plugs already has these properties. When reinstalling I would use it, but not when new.
