Here's a new update on SyntaxHighlighting goodie. This one incorporates Helge's updates from Apr 26, and does a more radical migration to syntax highlighting: instead of changing all methods that call #makeSelectorBoldIn: and #askIfAddStyle:req:, these methods are changed to call either their original versions or the syntax highlighting code (driven by the Preferences browseWithPrettyPrint).
http://fce.cc.gatech.edu/~bolot/squeak/opp/sq31-syntaxHighlighting.05Jun1813...
A reminder: this is Helge Horch's work, I just tweaked it to work with Squeak 3.1.
Bolot