This patch gives mutt a nice sidebar listing of mailboxes, like in the GUI's.
Again, all flames and comments direct to me, not the mutt list.

Thanks to Thomer Gil for his help with the latest 1.5.6 patch. He did all the work on it from my port of Version 8 to 1.5.6, so many thanks.

Also thanks go to Todd for an additional patch to 1.5.6 to fix other bugs.
Thomer's website can be found at: http://thomer.com/mutt, where he documents more features of the patch, and he's the current maintainer of it.
Versions of my mutt patch:
Thomer's patch, from a couple months ago.
Latest for CVS
Latest for 1.5.6
Todd's patch against 1.5.6(against patch-1.5.6.jrh.sidebar.8, should still work against patch 9)
Previous for 1.5.6
Version 10 for 1.5.6
Version 9 for 1.5.6
Version 8 for 1.5.6
Latest for 1.5.4
Previous
Version 6
Version 5
Version 4
Version 3
Version 2
Version 1

README

A screenshot of this miracle. Enjoy.
And here is my muttrc