I have been scripting in Python for ArcGIS 10, and so far I have just been using Notepad++.
I like how the Python command line interface code-completes arcpy functionality for you, showing you your options, and I was wondering if there is a way to add this feature to an external editor.
Ctrl-Shift-Spacehotkey will bring up the code completion "call tip" if you are for example in the middle of writing a function parameter list and you did something to close it. – blah238 Feb 17 '13 at 19:57