This is the archived source code for the Gamecube Disc Browser 2.1
http://projects.sappharad.com/gcn/dvdbrowser/
Version 1.0 was released in 2004.
Version 2.1 (final version) was released in 2006.

This is not necessarily a good example of how to do things, as I wasn't very familiar with low level hardware when I wrote it. But there was interest in a source code release, so here it is.