Some of the gallery hierarchy stuff probably doesn't work right yet, because I encountered an interesting problem that may change how we deal with these things.
If I have this hierarchy of galleries:
A B C B
How can I (the naive user) tell if those "B"s refer to the same gallery?
I also don't like the UI much for creating new subgalleries, but I couldn't think of anything better. (And before you suggest it: Expecting the user to figure out they need to right-click to create galleries is unreasonable.)