[plt-scheme] Scheme bindings for OSX Cocoa?

Hi,

   Is there a PLT package out there that supports Scheme bindings for 
the Cocoa classes in OSX?  I don't really have any idea *how* you'd 
make such a dynamic OO system fit into Scheme (inheritance, interfaces, 
and posing capability [replacing classes] to name a few], but I'm sure 
it's possible somehow.  Better yet, couple this with a PLT-xCode 
bridge, and perhaps a way to integrate Scheme and Obj-C code together.. 
  But I'd settle for just a set of simple Cocoa bindings for now..

jim