Re: Mt. Gox creator Jed McCaleb invites ‘alpha testers’ for secret Bitcoin project

My guess is that he's finally going to do something with that site he created in 2006: http://www.who.is/whois/coinconverter.com/

wondering which kind of audience would have wanted to convert which kind of coins in 2006 and how and why

That is actually kind of an odd coincidence.