Try Tomato Alert (Freebie)

Tomato Alert (http://tomatoalert.com) is a productivity tool (not a Pomodoro!) that I crafted for personal use, but I've decided to post it for "free": tweet to download and it's yours :)

It tracks the programs you use and alerts you when you stop working. Better than a plain Pomodoro Technique!

I hope it will help you to keep focused!