Now that I'm on the IronPython / DLR team, it seemed prudent to actually learn the Python language.
There are some good online tutorials, but I found the book "Learning Python" by Mark Lutz to be extremely good.
If you really want to learn the language, it's worth buying the book.
It's large and thorough, yet a fast read. Things I liked about the book:
I did all the exercises and experimenting with IronPython 1.1, which is a testimony IPY's fidelity to the original language.
After reading, further gaps can be filled in from http://www.python.org/doc/
C/C++, C#, and Python certainly have some similarities, but they all have very distinct idioms too. So comparing the languages should be rich blog fodder.