There are some horrid logos in there, and some very well done ones as well. My favorite: http://media.nokrev.com/junk/haskell-logos/logo9.png
Personally, my first impression is that it looks like a subway system's logo: you have arrows on the left to designate travelling, rails on the right, and the various strokes remind me of the complexity of the interconnected lines of a subway system.
Just a thought.
I agree that simplicity is very important, I like this one best: http://haskell.org/sitewiki/images/2/21/Haskell-apankrat.png
(I also agree, that logo is pure awesomeness)
Most people think >λ= means "greater than" "lambda" "equals", not a clever play on monad binding op and lambda...