I'm in the middle of migrating. My previous site was a circa-2007 custom affair, built on ASP.NET MVC1 and SQL. But last year I got a MacBook Pro, which is by a stretch the finest machine I've ever used. This new site is still custom, built 100% on a Mac. It's ASP.NET MVC3 running on the Mono framework, with a cloud-based MongoDB backend and Twitter integration for comments. The UI is coming together with Knockout and PJAX.
So while I port my old posts into the cloud, I hope you'll stay engaged via Twitter. See you around!