For anyone interested, here's the latest mockup for the Media module, courtesy of Maarten Verbaarschot (mverbaar) of the D7UX team!

(original at http://www.flickr.com/photos/mverbaar/3632702590/in/set-72157619245872526/)
You can see more screenshots at the D7UX Microproject - Media Library for D7 issue.
And Jon Stacey (jmstacey) is doing a bang-up job of helping to realize this vision, via the Google Summer of Code! He's been hard at work with Andrew Morton (drewish), another co-mentor, to make this happen for Drupal 7. (And yes, we're also continuing to back-port this work into 6.)
The final chapter of that section, "Automated Security Testing", explores some currently available modules that should be in the bag of tricks for not only module developers
"Drupal's User and Permissions System", begins the section most exciting to me as a developer, by describing the API and hooks offered by Drupal to help create more secure code.
"Anatomy of Vulnerabilities", offers an extensive overview of the predominate routes of attack that may be taken against a site.
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