Jeff: Those links are a gold mine! I especially like the Google example for its simplicity, ease of navigation, and as it allows you both to see the entries on one page and, by clicking the tree, skip to particular entries. The UBB example has the additional merit of allowing for a brief summary of the thread topic, and I think this display to be especially suited to academic purposes where instructors and others are addressing particular topics. There is much food for thought here! Thanks a lot!
All the best,
Bruce
