Thinking of a parallel with Java for a second, is there a GUI library out there that's structured like Java Swing? Meaning, there is a GUI library that has a small platform-specific GUI foundation (e.g. a per platform implementation of the core AWT functionality) and the rest of the functionality is pure haskell? Supporting cross platform guis is often a bit ... complicated. Java attempted to resolve their debug-everywhere nightmare with AWT by making the per-platform bit as small as possible, and building everything else in Java. I guess in theory gtk and wxWidgets take on this support burden, but you do get some fairly hefty imperative apis as a result. Perhaps it would make sense to focus efforts on stabilising a small 'core gui' library that can act as the foundation stone for all manner of pure haskell gui libraries?* Or perhaps this already exists? Just a thought. Cheers, Sam