emacs-w3m doesn't play well with (iswitchb-mode) in Emacs 22.0.92

[Chris Moore <dooglus@xxxxxxxxx>]

I have
  (iswitchb-mode)
in my .emacs file.

This results in C-x b being bound to iswitchb-buffer everywhere, and
gives me a different 'switch buffer' experience.  Everywhere, that is,
except for in the *w3m* buffer, where C-b is bound to
w3m-e21-switch-to-buffer, which seems to act very much like the
default switch-to-buffer command.