Fizzbuzz
I was reading this so I came up with a quick solution in Haskell.
fizz :: Int -> String
fizz n | n `mod` 15 == 0 = "FizzBuzz"
| n `mod` 3 == 0 = "Fizz"
| n `mod` 5 == 0 = "Buzz"
| otherwise = show n
main :: IO()
main = mapM_ putStrLn $ map fizz [1..100]
There's also a page Haskell Quiz/FizzBuzz with another solution.