I haven't really thought about GUIs much in the last decade, but if one were to embark on such an endeavor, I think an appropriate starting point would be SDL with OpenGL.
There would be no very little API structure to hinder the pure functional approach, and it would be portable to a wide variety of platforms. SDL includes support Linux/Win/OSX and now the iPhone. Also you'd have unofficial support for another few platforms. The 1st step would be to build a vector graphics lib for Haskell on OpenGL, but after that, perhaps much of Fruit could be fitted in. (Just a WAG, never heard of the API before now)
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