Zero Charge Registration  
   Provides domain registration with no hidden charges.
   http://www.0chargedomainnameregistration.com/

Zone Servers  
   Registration in the uk, ca, com, net, org, info, biz, cc and tv names.
   http://www.zoneservers.com/

Zero Risk Names  
   Domain name registration for .com, .net and .org plus an additional 15 extensions, email forwarding and domain parking.
   http://www.0risknames.com

Zero-a-Register  
   Site offers domain registration and web hosting.
   http://www.0-a-register.com/

ZiD  
   Site offers domain name registration in .com, .net, .org and .ca.
   http://domain-name-canada.com/