I honestly think Directory is fine. I'd even ponder something like Yellow Pages which is exactly what it is - find someone!

It is okay to use metaphors if they're well understood. A directory is something you use to find things. Sure, pedantically you can say a directory is just a list. But that's right now in 2009, maybe in 2020 we're going to have directories on walls that you can talk to and scroll and search!

(Or maybe the neural mapping software will be done by then.)