
You can tell it to remind you every X minutes after you have built up Y reviews or haven't practiced for Z hours, whichever comes first. To use it, just double click SkritterAgent.jar. I recommend setting it to start up with your computer, so that it's always on to remind you. Don't worry; it'll stay out of your way.
Faceleg says it isn't pretty yet on Mac, but it should work. Let him or me know if you see any problems. Thanks for developing this, Faceleg! I've been able to practice more regularly since I started using it, and regular practice is next to awesomeness.