It answered many of my questions on the nuances of Mercurial. The branch model, bare repositories, and command equivalence table were especially helpful for someone like myself who has used both systems but never fully understood the distinctions.
The thing I like about Komodo is the graphical debugger which even works for threaded Python. As an editor, it is okay and has the useful feature that it's interface is very similar on Windows, Mac, and Linux (it's built using Mozilla's XUL).