Can't get more functional than scheme :) Sure, per his def of FP, scheme is numbers 1 through 18 on the league table ;-} Other defs:

http://dl.dropbox.com/u/7810909/docs/what-does-fp-mean/what-...

http://existentialtype.wordpress.com/2011/03/16/what-is-a-fu...

http://stackoverflow.com/questions/2254368/if-java-people-go...

I'm not taking sides, i like haskell, scala, clojure just fine, I'm sure I would like racket or CL if i picked them up.