Our goal is to be simpler to use, to focus on time tracking using a timer (rather than logging time after the fact), and to have an aesthetically pleasing application.
We've got some ideas up our sleeve for mobile and desktop innovation, but thought we'd build the web side first as (we hope) it's useful as a standalone product.
GPS location tracking is one of the features we have in mind! Great to hear someone else is keen for it.
Something else that we haven't seen is better browser integration - some kind of bookmarklet that gives you a timer whatever site you're on in your browser. This would be good for web developers and other users that spend a lot of time working in the browser. What do you think of that idea?