Hello,
I've released a "Code Walkthrough" for the SMAUG codebase. It's basically a high-level, birds-eye view of how the SMAUG universe works, and because its so high-level and not focused on detailed specifics, it should be very similar to any other codebase in the Diku tree. I tried to write the walkthrough in such a way that it will give coding insight to coders of almost any skill level... I hope you learn something from it.
http://smaugcodesnippets.blogspot.com/2008/09/smaug-code-server-code-walkthrough.html