I do C-x 3 and load a homebrew "tiny-mode" that shrinks the font size in the second window. Maybe I'll package it up and post it later.
I'm not much of an elisp programmer, but this seems to work reasonably well. It depends on Emacs 23. To use, load and run mini-map-mode.
I pasted the link content into .emacs, downloaded highlight-current-line, and changed the font to Courier New (don't have Consolas). Do you have any ideas?
edit: As far as I can tell, it crashes even with clojure-mode not loaded. Emacs 23.0.91.1, btw.