Ok I am not sure this would be very useful as it stands. I don't think many people need that kind of timer while having an internet connection. But you may be more succesful if you turn it into an iphone/blackberry/android app that does not need constant connectivity.<p>I will give you another idea which is tangentially related to what you are doing. There are timers that are used for people that bill for their time (e.g., consultants, lawyers, accountants, etc.) They are some pretty expensive ones that are used by top law firms and work very well. And there are a lot of cheaper ones that are aimed at startups and the like and are pretty terrible.<p>I am an attorney that just left one of the top firms in the nation to try to start my own practice. One of the biggest annoyances is that I cannot find a timer application that works as well as the one my law firm used. It should not be that difficult. But all the applications aimed at small businesses are pretty bad.<p>So I think if you aimed your timer for people that bill for their time, you might be succesful. But you have to make it good. You have to make it so it supports client- matter billing. Also make sure it can easily interact with standard accounting software. Also make sure it is easy to switch between tasks and create new tasks (this where most existing applications fail epically).<p>Basicly, if you can make a billing timer which is as good as Capre Diem but does not cost an arm and a leg, I think you may be very successful.