I was all ready to be like "yeah, but org-mode can already..." and then I watched the video. You know what? This is actually a great idea. I love the timer. The graphics are very clean and nice. This is a great simple little idea.
Of course, now I'm like .... "huh, how could i get that functionality in org-mode?" but... ;)
for those of you not using org-mode... watch the really short vid and see if it's something that'd work for your brain.
[edit: yup. org-mode has something similar, just not a running timer visible _in_ your doc]