Tabs on the Asset Pane

I talked with John at length about the asset pane tonight, and we arrived at the conclusion that (since the intent is for most of the asset management to be done via tags) there's not a lot of value having a tab for each asset directory. So we'll probably have two tabs or so: "All" and "In Use". "All" would be sorted by modification time, "In Use" would be sorted from most to least recently used.