>most of them unlikely to be good for anything except for word games.

with the notable exception of floccinaucinihilpilification, which has proved to be worthless in the extreme, to the point of being invaluable to me. [cross-threading to weakly themes and see also http://home.mn.rr.com/wwftd/)

edit: and it beats out that 'antidis-' word by one letter, which is why it gets the OED1 claim.
edit2: I know what you mean about a thrill -- mine now comes with saying floccinaucinihilipilification
edit3: actually, this is a subject that was covered by AWAD back in '97: http://www.wordsmith.org/awad/archives/0597