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Does anyone know a good tut or book that describes how to develop a GUI/widget library? I already read this which was a bit too brief for me.
Language/platform doesn't matter, I just need something to tell me how to go about it.

I started writing a small GUI tutorial for QBasic, but it will take some time to finish... Few weeks or so. But it explaines only basic gui controls and such.

Oh, great, looking forward to reading it. I actually managed to hack up a GUI library thing in plain C during the last few days. It's windowless, with no overlapping things, rather simple. ATM it has buttons and semi-nice textboxes, and I plan on adding sliders tonight It can be used on anything that supports blitting bitmaps basically, ATM there is only a GDI interface though.