Concatenative programming languages

Today in doctor dobb's update newsletter I saw a link to an post on doctor dobb's codetalk by christopher diggins about concatenative programming. I knew there were functional, object oriented, imperative, but I did not know there were concatenative programming languages before I read the post.                                

The post has a link to a wiki with a bunch of concatenative programming languages. I went to the wiki and looked around for a few minutes and then decided I have to try one of the programming languages sometime this year, I have already tried forth a little bit thought. Aah programming languages I love them.