Michael,

> Hello, fellow OS X Ruby fans. I was wondering if there was any nice
> Cocoa/Carbon (with ruby highlighting/features) editor that you
> use/know about?

Emacs runs in Terminal, and with ruby-mode.el (or whatever it's called) you
can have colorized/highlighted text.

Jim
-- 
Jim Menard, jimm / io.com, http://www.io.com/~jimm/
"Any sufficiently advanced technology is insufficiently documented."
    -- kabdib on slashdot