It would be very useful to have a "Date Added" column in the media library that could be sorted on. This would not only be useful in identifing old content, but also allow the user to see any new files added to the physical folder but not imported into the library yet (I'm assuming that un-imported files would have a blank for the date added column).

As the libraries grow to multiple pages of files, it can be time-consuming to find new content added physically but not imported, because you have to check every page.

Additionally, it'd be really nice to be able to do a file name search against the media library, since users don't always know where files are stored.