Though I tried most the above listed IDEs, sticking with a few for awhile, I always find myself gravitating back to the one no one ever mentions: IDLE. It's simple, fast, and with multiple monitors the lack of tabs really isn't much of a problem.
The biggest reason I've found myself using IDLE is the colorizing...I've found little support in other editors for builtins having their own color. Granted, I haven't gotten far enough to bother with that in some editors. Eclipse, for example, performs like a dog on my dual opteron workstation w/ 2GB of RAM, which is more than enough to annoy me. I shouldn't have to wait more than about 1 second for an editor to start and then open what is essentially a text file :-P. -- http://mail.python.org/mailman/listinfo/python-list