STL and MFC Madness

I recently purchased a book which teaches me the basics of the STL. It's a damn good book. I'm learning a lot I didn't know about containers, templates, etc.

And so this is my dilemma. Can the STL still do WIN GUI stuff, or is it essential to look into the MFC for that sorta thing? Also, which should I really be looking at more seriously? From what I understand, the MFC basically implements its own version of the STL. Am I right in saying that? I'm strongly considering buying a book on MFC programming and was wondering if this is a wise move? Can anybody give me more details?

Thanks in advance.