Gist of WordPress Plugin Development on a Whiteboard
December 7th, 2009
Created this while peeking into WordPress code after a long long time!
Hope this is useful & handy to you! 
Gist of WP Plugin Development on a whiteboard – Click to see full-size image
[Update] Our new intern, Anirudh, just came across an interesting, comprehensive & useful WordPress Plugin Development Crash Course which also has a very detailed screencast video, as Anirudh puts it. We share it here with you because we thought it might be useful to you! BTW, there are two bit.ly links on the diagram for you to follow. They point you to the official WordPress Codex pages for plugin development.
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