mt open source
I have been using movable type for (/me goes to check my earliest entries) the beginning of 2003. In that time i have watched the application grow from a simple, beautifully constructed perl application to a beautifully constructed perl based publishing platform. I have a (sorely under-maintained) plugin - MTRecentImages and have set up blogs for family and friends.
Now that the release has been open sourced i am getting ready to roll it out to our many-hundred engineer team at work with some customizations to integrate into our environment better.
Congrats to the MT team for a continually improving product and platform and for keeping the platform open for all of us.