Coincidently I've just read several chapters from the Learn you a Haskell book. I couldn't write any serious Haskell project in near future, but learning it has been so much fun. No surprised when many other programmers are touching it on weekends.
LYAH is great for getting a first taste of Haskell! Once you want to write more serious programs, I'd highly recommend that you get http://haskellbook.com/ – it's very well structured and goes all the way to practical, real-world programs.