Update: It was of course Eric Liu who wrote the logger. Stephen Chu wrote this adjacent post about Rails. Sorry, Eric and Stephen. Thanks to the people who left comments pointing this out.
I spent several years being sysadmin at one project. Possibly the most popular thing I ever did there was enable the Ant AnsiColorLogger for all the developers, giving them highlighting in the IDE and the build.
Anyway, Stephen Chu from ThoughtWorks just wrote the same for Nant. Nice work.