From Hostgator’s blog:
HostGator is mere weeks away from offering domain registration from our very own domain registrar service. Not only will the registration prices be significantly cheaper than GoDaddy, but you will also receive the legendary 24/7 around the clock support that you have come to know and love from HostGator.
Not sure how much cheaper they can really go given the ICANN fees, but this will certainly be interesting to look at. What I would be looking for is bulk registrations as well as the variety oc ccTLDs they would offer.