bpython seems to be much better than ipython ... switching now ~
Well, depending on what you want from it -- the curses UI and autocomplete implementation are very nice, but ipython has a lot of additional features that bpython isn't interested in implemented. I miss the ??function_name feature in ipython that shows the complete source code for a function or class, since the function header isn't always informative enough; I tend to use ipython's bash emulation pretty frequently too.
I just need a better replacement for the default python shell. iPython has those nice extras, but I rarely use them ... so bpython is a much better choice for me now :)
That is true only if you don't use the magic functions!