You appear to be attempting to use a technical solution to a people problem. Have you looked into different techniques for improving focus and concentration?

For example, the Pomodoro technique helps me with concentration and self-discipline, by breaking up my time into really short sprints.

Another thought: Pragmatic Thinking and Learning: Refactor Your Wetware has some good stuff in it about focus and concentration.

I just can't help thinking that it's gonna be difficult to completely remove distractions from one's life, and that learning to deal with them more effectively is a good thing.