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IDEPlatform$ Notes
IDLE all Included with Python, based on tkinter tookit
PythonWinWindows Package includes COM/.NET libraries for Windows
Eclipse+PyDevUNIX/Windows  
PyScripterWindows x32/64  Popular with ArcGIS users
WingIDEUNIX/OSX/Win $ 
SlickEdit $ Multi-language
SpyderLinux/OSX/Win A lot like the Matlab IDE. See: Adding Spyder to the EPD. Part of Anaconda distribution
EPD 8 $Beta; w/ Enthought USGS site-license
Vim + Py  Vim Python plugin