This modules plus a few others (listed on the page) allow you to create a slick menu for browsing hierarchical taxonomies in Drupal. Not quite Hulu filtering, but still great.

This screen cast shows the power of integrating the calais taxonomy recommendation engine into the already powerful Drupal taxonomy system. Combining these two platforms, your content can be hyper-meta linked for maximum search-ability, contextualized, and SEOed.

An interesting idea... let the users tag content rather than just the owner. hmmmm.