Internal co-reg heaven. Sam Michel, publisher of a variety of email newsletters and discussion groups targeting British Internet-related professionals, emails in that, "Since using co- reg internally (i.e. when you sign up for one of our lists, promoting our others) we've seen registrations increase by 40% overall. On average 75% of subscribers are signing up for more than one list. We will be selling co-registration space to other media owners and clients from the start of 2002."

He also noted his biggest challenge is the term "co-registration" itself as many potential buyers still have no idea what he's
talking about.