It didn't disappear - half of my posts are private and can be viewed by anyone who has the URL. I send them to people who send me emails or on twitter - sometimes they are a bit private for me to put out there and have people discussing them and so on.

There is the post you are talking about:

Compromise: http://blog.cubeofm.com/private/HhdtfcyFis

After rereading it, I did not want to publicize it. It's not a conspiracy, it's just my decision that every public facing article should be something consistent and relevant. Articles that I get to dislike after a while I make them private.