I see Lugaru just released a Mac OS X version of their Emacs-style Epsilon editor.
A long time ago (late 80s) I used Epsilon for DOS and I liked it because it was the closest thing to Emacs. Mac OS X includes Emacs, plus enhanced X11 & Carbon versions are available, all free. Epsilon is an X11 application that sells for $250 – it doesn’t even use the Mac GUI. Why should I pay $250 for Epsilon, which doesn’t offer much more for an Emacs user, when good free editors are available?