This app *really* worked for me! Sadly, though, it appears have been abandoned. I get a prompt for an Activation Code (which I have), but when I enter that and commit it, the same dialog pops up a couple of minutes later. Sad. Surprisingly, I can't find any other apps that do this. It seems like a perfect (and simple) solution to making/changing habits, since most of us sit in front of computers for *hours* every day. <sigh>