The old site has been retired and is now available at 2002-2012.mattwilcox.net, URLs to old articles should be redirecting there already.
As for the main domain; I don't know for sure what I'm doing here yet. I'm currently taking my first steps with a VPS, with nginx & node.js, and making my way through 7 Databases in 7 weeks - the time seemed right to rip up the old and learn something new. There's a lot of 'new' to learn.
Why learn so much new stuff rather than refresh my PHP/MySQL knowledge?