Boxesandarrows is a pretty great site for the budding IA.

This is an interesting article I found referenced from Drupal. My personal opinion is that it’s a good theoretical look at the possibilities behind metadata-based websites, and it highlights a lot of the major value behind it. Unfortunately, it kind of ducks the question of implementability, and a lot of the commercial vendors for ontological software also fail to show a realistic implementation case study.

I did find this PPT from a governmental org pretty interesting though, and they may have actually completed a functional system.