How is GUI programming in Python?

[Chris Stewart]

I've always had an interest in Python and would like to dabble in it  
further.  I've worked on a few very small command line programs but  
nothing of any complexity.  I'd like to build a really simple GUI app  
that will work across Mac, Windows, and Linux.  How painful is that  
going to be?  I used to be really familiar with Java Swing a few years  
ago.  I imagine it will be similar.

Next, what would you say is the best framework I should look into?   
I'm curious to hear opinions on that.

Chris Stewart
cstewart913 at gmail.com