Cool.
I'm currently working on taking
http://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_Hours and making it an iPad app. ;-) Hopefully I'll be done tomorrow and be able to share it.
I'm noodling with how to generically express Obj-C method invocations in Haskell in a way that would allow for automatic binding/ffi generation via Obj-C header files. I'm not sure it's possible, but it'd certainly reduce the amount of boilerplate (it's also been a long time since I've done low level Obj-C dispatch snooping... I wonder what's changed. ;-) )
I'm also thinking about how to use Haskell's GC to do automatic retain/release calls...
Anyway... more as I make progress.