This version will automatically update (now set to background updates).
It may need to update your .Net framework, it will do this automatically.
Recently added site blocking via Privoxy - check out Site Blocking with Privoxy and Pomodoro.
Pomodoro is a work technique that is best described here: http://www.pomodorotechnique.com/
I've found it very helpful, and while there are a few pomodoro software applications none suited my working style - some were too distracting, some lacked features and some were overly complicated (I don't want to fill out a page full of details just to start working on something!).
So I wrote my own, it features two progress bars for quick visual of how you're doing, plus a countdown and alert options. It's basic so far but it's already eclipsed the other products for my personal use and I'll be adding more features in the near future. I hope you find it as handy as I do!
Please let me know if you have any suggestions for the application, feedback is always welcome.