Wouldn't it be cool to take the kernel source, strip it down (remove all 'drivers'), replace the memory and task (ELF) system with calls to win32 API, add Windoze specific 'drivers' (for X as well) and compile the thing on windoze.
Done! Now you can run all the debian stuff (without any recompilation or such). The downside is that some low-level i/o stuff wouldn't be supported. Another problem is that it may not be legal to do so (GPL). Best regards, Peter Bjorklund

