This screencast demonstrates how to build a database driven, Markdown powered wiki from scratch in around 25 lines of code. Lines of code is of course a poor metric, but I think the end result of part 1 (more planned) packs quite a lot of functionality for what is very simple and readable code. I'll be building on this code in future screencasts, to create something which is more feature complete.
I found creating this to be a challenge; thinking, typing and talking is about 50% more things than I can do at once! Hopefully I'll master it as I go.
For more information on Moya, please see www.moyaproject.com.