The MITT is a cell phone application that allows you to concentrate on your workouts instead of your watch. It is completely versatile allowing you to set any number of timed intervals you need. You set the delay time, work time, rest time, and number of rounds.
You can download a free trial version to try it before you buy it.
This works great for martial arts / boxing rounds, running, tabata, HIIT, etc.
This application works on most cell phones, but does not work on iPhone or iPods.
I have been using this for weight lifting, running, and TRX intervals. Works great.