A Drush Tutorial that's not a webcast

First of all, apologies if this ends up cross-posted.

In case anyone is interested, I've been looking for ages for a nice, simple introduction to Drush that doesn't involve downloading an enormous video file, i.e. something that would work in Instapaper. Eventually I gave up and wrote my own, and I've been using it to educate colleagues who haven't quite understood what Drush can do yet.

You can find the article at: http://www.opc.com.au/web-development/introduction-drush-drupal-power-tool

Comments and feedback welcome - especially if something is misleading or incorrect.

If it's helpful to anyone, please let me know. I'm also thinking of writing something similar for the Features module.