I'm concerned though that if you need people to email you so that you can add info to the database, you're going to be in for an awful lot of work if this thing takes off, maybe beyond your ability to provide.
The other thing I was wondering is if kopibibli will provide any kind of API itself, so other applications can query your database? There's a world of potential for third parties there if so.
(reposted as reply to my earlier post)