I've uploaded a package named heaps to Hackage that provides Brodal-Okasaki bootstrapped skew-binomial heaps in Haskell.

The main features of the library are that it provides a nice containers-like API with provably asymptotically optimal functional heap operations including O(1) insert and O(1) union, and that the library design jump through a number of hoops to provide implementations of common Haskell typeclasses such as Foldable, Data and Typeable.