I ran across PyX ( yesterday. It handles
eps and postscript beautifully! Combine with this snippet of code:

    import pygtk; pygtk.require("2.0")
    import sys
    import gtk

    import bonobo
    import bonobo.ui

    win = gtk.Window()
    win.connect("delete-event", gtk.mainquit)

    container = bonobo.ui.Container()
    control = bonobo.ui.Widget("file://home2/njh/numpy.pdf",
    # A control widget is just like any other GtkWidget.


And you have a simple plotting system with wysiwyg. Should Matplotlib
move towards using PyX?