I perform python development for cross platform firmware integration and analysis on a daily basis and the IDE I use and recommend is Komodo from ActiveState. Our worldwide development group (30) has recently all purchased the professional version as it integrates with several version control systems, has a built-in python debugger, a mutli-language/package GUI builder, and in-line code lookup/auto-complete functionality. There are a few nice-to-haves which aren't available such as: C (++, # or otherwise) auto-complete and alternate py-documentation viewer but the pros far outweighed the cons for our development team. http://www.activestate.com/Products/Komodo/?tn=1
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