Hmm, I started on Gentoo around 2004. In 2007 I used Ubuntu for awhile. I then wanted to go back to Gentoo so I used Sabayon for awhile. I started using Arch when KDE4.0 just came out. So that would be in 2008. Haven't switched since then.
No announcement yet.
What Was Your First Linux Distribution?
This is a sticky topic.