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I'm comming from the background of being primarily a data processing
programmer (Python) and I'd like to do some GUI stuff for a comercial
project but I have quite a bit of time, nothing too complex but it has
to work on Windows98+ OSX and Solaris so I was thinking Tkinter. I was
wondering if there were some sites with a good overview of the whole
Python +Tk shpeal, I've got some code examples and "Programming Python
2nd Edition" but that's more of a learn by example, rather than an
overview of concepts. Anyone have a good recommendation?

Look at:
http://www.ferg.org/thinking_in_tkinter/index.html

It may be useful, and it has links to other places that may be useful.