I'm not a Pandas user myself, but a quick search for "pandas gui" turns up the Pandas project's GSOC 2012 proposal:
Currently the only way to interact with these objects is through the API. This project proposes to add a simple Qt or Tk GUI with which to view and manipulate these objects.
So, there's no GUI, but if you'd write one using Qt or Tk, the project might be interested in your code.
