PSD Validator

Find out how good your PSD file is structured using some of the rules from the site Photoshop Etiquette.
Gives you errors or warnings if your file doesn't use groups, if your layers has names like "Rectangle copy 22" or if the font sizes isn't set to whole pixels. And a lot of other things.

Check it out at:
http://www.psdvalidator.com

Built it in a few days while learning some Ruby on Rails (yey!) on the way. It uses Layervault's gem PSD.rb for parsing.
Feedback (and bug reports) are more than welcome!