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GitHub User: jamesds
This was very interesting Ryan, thank you. I hope to see more screencasts on Rails' internals in the future!
Good point! I've put a commit into docrails, the Rails documentation repository, to add a link to this guide. I've also tried to help tidy up the Initialization guide a little, as it's quite rough around the edges. It's community-maintained, so anyone else able to help should go for it.