Another lesson from my travels: if you don't pay up your domain name registration before going on a trip, and it happens to expire, your site will become inaccessible. If you tried to visit the site a couple of days ago, you probably hit a brick wall instead. :-) Waiting for me in my inbox when I returned to Brisbane Sunday afternoon were several emails from gandi.net reminding me that my registration of tylerbutler.com was due to expire soon, then really soon, then had expired. Thankfully nobody took it from me while it was available. :-) I got it reregistered and things should be back to normal now.
A quick plug for Gandi - they're nearly twice the price of some other registrars, but I stick with them because they have a great interface for editing DNS records, they give you a lot of control over the DNS settings themselves, they can host mail for your domain, etc. Well worth the additional cost as far as I am concerned. Highly recommended.