Check out SciTE. It is from the creator of Scintilla and it's great. It's not a full IDE but with python you'll learn you really don't need it, at least IMHO. It's fast and works on windows and Linux. http://www.scintilla.org/SciTE.html
I would also checkout WingIDE. Its one of the best, again IMHO. If you write open source apps you can have the IDE for free although they do ask to take a look at your source code and that you have a web page up for it. I believe those are the only requirements. If you don't have your project to that stage yet, they will give you a 6 month license to get it there. http://wingware.com Wing IDE Professional v. 2.x $179.00 $295.00 $395.00 Wing IDE Personal v. 2.x $35.00 $60.00 $80.00 -- http://mail.python.org/mailman/listinfo/python-list
