Dyn.com. They don't cover a lot of TLDs, and aren't the cheapest if you have 100s of domains, but they are competent have some nices extra features and browsing

Dyn.com. They don't cover a lot of TLDs, and aren't the cheapest if you have 100s of domains, but they are competent have some nices extra features and browsing their pages doesn't feel like walking through a Bangkok market.