[Haskell-cafe] New (simple) Lazy Evaluation tutorial

Hi all, An interesting question came up in #haskell the other day, and I took the resulting discussion and wrapped it up into a simple tutorial for the wiki. Since I'm quite a newbie to haskell myself, I'd appreciate any double-checking of my logic and, of course, any other comments/suggestions. Thanks to Cale for his efforts on this problem, and to the original asker, whose name I can't recall. http://www.haskell.org/haskellwiki/Haskell/Lazy_Evaluation