This was my first reading. Definitely a must have. Although a quarter away in the book i had to abandon. The problem is that i started to know pretty things about Python, but nothing about how to use in Maya. I’ll get back to it for sure in the future.
The Second resource i found was Chad Vernon’s website. Great material in there.
There is also the Python for Maya google group, but hey!!!, those discussions are still way too advanced for me.
After these, i found this Technical Artist on twitter who has a nice blog about Python, his name is John Neumann. check here.