Since September 2008, the registrations on HotNameList have been spread among the following registrars:
Wild West 3.8%
All Other Registrars 24.1%
Like total market share of all COM domains, Godaddy is in the lead. But the other items don't really match the total market share for all registars. I think this is because buyers at HotNameList include many more serious investors.
Happy Domain Hunting!