BankNoteWiki

Description
This wiki was started November 2006 so it's still very early days, hopefully with time this wiki can become a comprehensive guide for collectors of bank notes and paper money with lots of colour images, detailed descriptions and estimated values.

The wiki was overrun by spammers in 2007 and closed by its owner presumably later that year. 

Now the domain redirects to http://allbanknotes.com/ which is not a wiki but still a collaborative site.