Getting in with the Christmas spirit, Namecheap have released their December 2008 coupon.

Coupon Code: THREEKINGS

Using this Namecheap coupon will give you domain registrations for $8.81.  Its important to remember that this will only work with new registrations (not renewals).  

Get $7.95 per new register of domain up to 3 years. (Or if registering for one year its 7.95 {Save $0.93}, if registering for two years its 15.90 {Save $1.86}, if registering for three years its 23.85 {Save $2.79})

Coupon Code: INTERFACE