5 questions for Y Combinator's Paul Graham

Not entirely related, but I really like using 3rd party DNS services. (I use DNSMadeEasy.) They offer reliability, because they disperse their DNS machines geographically.

If you keep your TTL low enough and your host has a massive outage, you can reroute traffic to hosting environments. (If for no other reason to say, "Uh. Our host just got nuked. Give us a few hours to get everything installed on our new host.")