Gibson Pewter was probably the first website I did professionally. I can't quite remember when I first did it, but I think it was around 1999. Back in the bad old days of Adobe GoLive, raw HTML, and CSS that was just in it's nappies.
The current site is built on WordPress, and even that is starting to feel creaky. So I'm currently in the process of rebuilding from the ground up using Drupal.