Nope, you didn't scare me off, Pierre. I've written a good bit here about my mentalist activities (in a Derren Brown thread, I think).
Keel has had his share of mistakes, as has Vallee. Keel was initially hoaxed by a writer friend of mine, Tom Monteleone, back in the 70s. Tom feels pretty bad about it now -- he was a college kid and was just trying to have some fun, but some stuff he made up just synchronistically matched the account of a totally unrelated contactee (Derenberger). Keel published Tom's account in "Mothman Prophecies."
Here's an interesting article from Jerry Clark which mentions the hoax. I don't always agree with Jerry, but I respect the work he's done over the past few decades.
http://ourstrangeplanet.com/index.php?o ... &Itemid=60