Found it. Clause 8 here:
http://www.fulltiltpoker.com/site-terms
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Full Tilt Poker prohibits the use of external player assistance programs (EPA Programs) which are designed to provide users with an unfair advantage over their opponents. Full Tilt Poker defines external to mean computer software (other than the Full Tilt Poker game client), and non-software-based databases or profiles (e.g., web sites and subscription services). Full Tilt Poker defines an unfair advantage as a user accessing or compiling information on other players beyond that which the user has personally observed through his or her own game play.
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