My domain wasn’t working for ~24 hours due to my switching from GoDaddy to Namecheap. Although it’s possible to make that kind of switch with minimal downtime, in my case:
It was an impulse decision on my part. (Finally got some time to reflect on GoDaddy’s support for SOPA. As well as the elephant killing and the tacky “babe marketing”. SOPA was strike three.)
Namecheap seemed to be struggling with an unexpected number of transfers, inconveniently over the holiday weekend. (In fairness to GoDaddy, maybe their delay was at least partly due to the same reason.)
Fortunately it’s not as if greghendershott.com is a hot destination for millions of fans. Or dozens.
Also, I wanted to mention that I did a couple live chats with Namecheap support and they were very helpful and quick.