`Modern Tkinter for Busy Python Developers <http://www.amazon.com/Modern-Tkinter-Python-Developers-ebook/dp/B0071QDNLO/>`_
Book by Mark Rozerman about building attractive and modern graphical user interfaces with Python and Tkinter.
- `An Introduction to Tkinter <http://www.pythonware.com/library/an-introduction-to-tkinter.htm>`_
- Fredrik Lundh's on-line reference material.
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`Python and Tkinter Programming <http://www.amazon.com/exec/obidos/ASIN/1884777813>`_
The book by John Grayson (ISBN 1-884777-81-3).