I've used many of the ideas behind Trexy to help with my own programming productivity.
I wrote a system called "The Goo" that helps me stick "Things" together behind the scenes. The Goo leaves a "Trail" behind in your working environment. I've decided to open source the software behind The Goo as a thank you to all the other open source software developers who have helped me.
You can find it here: http://thegoo.org.