directNIC.com

Good Points:

• Low registration price - $15 a domain per year.
• Simple, Streamlined Order Process.
• Good Management Interface. You can buy features as you need them.
• They don't heavily push other products and services on you.

Bad Points:

• No Domain Auto-Renewal - You have to manually renew your domain when it expires.

GoDaddy.com

Good Points:

• Domain Auto-Renewal - You get automatically billed again when your domain expires, and it gets renewed.
• Great Management Interface.
• Cheap Domains - $9.95 a domain per year.

Bad Points:

• Very Pushy about other offers. Leave me alone and just sell me a domain!