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The Win32 API includes not just Graphics but also Systemy stuff, so there are two options: either it has its own top-level category, [...]

I'd prefer that, too.

Has anything been decided about POSIX yet?

Nope. But I'm thinking that Posix should be divided into two, with the networking stuff going in Network.Posix (an evolution of the current SocketPrim library) and the rest in System.Posix, possibly further subdivided within there. Unfortunately this breaks our rule of naming libraries by functionality, but again I think I prefer System Posix to System Directory Posix IO Posix Time Posix etc. Cheers, Simon