You might be thinking of Zed Shaw's "Learn Python the Hard Way", which started a spat between him and Mark Pilgrim over the best way to teach Python. It was also ripped off to make a Ruby version later, which Zed got pretty annoyed at (FWIW, the Ruby version basically replaced the Python examples with Ruby, while not changing the explanations - which were very much tied to Python).

However, none of that has anything to do with Learn You a Haskell, which looks excellent and will probably mean I don't make my savings goal next week :<.

Zed Shaw wrote "Learn Python The Hard Way", and then E. Martin started to write "Learn Ruby The Hard Way", without asking permission to copy the text.

There's a second book, started before LPTHW and LRTHW, called Learn You The Ruby, by me. But I haven't finished it :(