We find the premise of using the web for time tracking a flaw. IM is real time communication instead of ad hoc.
I've built something that I thought was brilliant, however when going through user testing it turned out the concept was flawed at its core.
I still think the idea has heaps of potential, but it turns out that unless I am able to fundamentally change the way people behave, that eventually I'll still be wrong.
I'm ok with being wrong, are you?