When investigating a Domain Name Registrar, it is wise to make sure that they offer a very easy to use domain name panel. This is a page which you login to and can centrally command your domain name's features and information, including:

• Your Whois Information
• Your Nameservers
• Pushing a Domain to another user.

The Good News is that most big name registrars have spent years refining their domain name panels for easy use.

This said, some are still easier to use than others, and recently ICANN has had to even crack down on a very few small registrars whose domain name panels where so hard to use that their users were constantly complaining and unable to make important changes.

The easiest thing to do is to take a demo of your chosen registars to see how easy their panels are to use, or quiz some professionals as to which registrars have the best ones in their opinion. It is most unlikely, though, that you'll have any trouble with any of the larger registrars in this regard.

Godaddy - Yahoo - Enom - Dotster - Register dot Com - Registerfly
Namecheap - Network Solutions