I'd mentioned my love of words without "in/il/im...", and my old friend James Tauber pointed me at http://paul.merton.ox.ac.uk/language/gruntled.html. This seems like the canonical paper on the nifty words. "It was concerting to see that she was communicado" :-)
I apologize to James and others about the problems with comments. Something seems wrong with MT and MT-Blacklist.... Not sure what, and I can't live life without MT-blacklist. I turned off MT-blacklist for about 2 minutes last week while re-installing it, and I got a comment spam for green cards in that time.. argh!