This is a cool little minor mode hack for Emacs. It’s like a last-typed heat map.

Onlookers will be amazed as you burn up the screen with your brilliant code.

Update: Rafal Jedruszek’s site above has gone AWOL, so I am preserving a copy here:

Highlight Tail (2270 downloads) version 1.3.9 (02 Apr 2007).