While the hierarchical nature of forums, sub-forums, and threads is analogous to a physical world (of filing cabinets, floors/rooms in a building, etc), there are things we can do to transcend that in the virtual world. I suggest adding the ability to apply tags to threads and/or the ability for users to see "related" threads. Examples: 1. If I am viewing a thread about a fare deal to a certain destination, it would be useful to see related Travel/Dining threads for that destination. 2. If I am viewing a thread about a promotion, it would help to see threads for similar promotions from the past. 3. If I am reading about an airport lounge run by one airline in an alliance, it'd be useful to have links to threads about other lounges in the alliance/airport. These are just off the top of my head. You might have better examples! Thoughts on this idea?