I saw your post in the SciPy mailing list. As you may know there's no 'main' plotting package for Python, there's still a bunch of different packages all with their pros and cons. But now momentum goes to matplotlib also because of his matlab-style commands
I suggest you to focus on the command-line interface, the GUI is good but useless for most programmers (please don't take it badly ;) ). I'm a qt fan and this is my favourite in the next "Python-SciPy plotting wars".
Go on with you work. Congratulations!- Jul 25 2005