ipython and matplotlib-0.83

John, is this due to the recent __init__ patch in

    > matplotlib? I haven't committed any of that, as I am in
    > the middle of the cvs->svn transition at ipython's site,
    > and without net access at home (moving), so I'm sort of
    > crippled right now.

I tried to fix backends/__init__.py to work with existing ipython
distributions. But I only tested calling plot commands from ipython
and not run. The latter exposes the bug. I think this should be
fixed on the matplotlib end, since I don't want to require everyone to
always have the latest ipython. I'll take a look and see if I can
figure out a workaround.