I’ve since received the following:

Hello Mark,

I noticed your recent post about Qlockwork.

I wanted to say that I’ve worked on a similar application myself, and have just released it. It’s called iFocus and you can check it out at www.ifocusonwork.com

It has some advantages over Qlockwork in that it’s 1. Free and 2. Allows  you to set goals for using certain applications and optionally choose to have them enforced.

Perhaps you want to mention it to your readers or use it yourself. Congratulations on getting so many people to follow you. I will read carefully over the description of the Autofocus system and will link to it from my site.

Rareş, from Boston, MA