A collection holds a bunch of items, so it seems to me that the "Last Modified" on a collection should reflect the date that an item was last added or revised in the collection, NOT the last time the actual collection item was modified (which is typically never). Doesn't that seem more intuitive? Otherwise, I tend to breeze right by a collection that has a very old date on it, not bothering to look inside since I incorrectly think that nothing has changed.

If a collection has other collections inside of it, I guess that means that the "Last Modified" date should filter through and update every parent until it reaches the top or root level?

I have a DMX installation where the hierarchy is done with a lot of collections (instead of categories) bevause I want a drilldown-style library.

Just food for thought Peter.