I have tried a lot of these work-timer apps. They tend to fall into two camps: those that try to do everything for you (client lists, reports, invoicing etc), or those that just record time. If you want the features, then I’d recommend OfficeTime, but if all you want is a list of tasks and a timer with a very direct and simple interface that doesn’t get in your way, I think NR Timer is now the best: there are still one or two minor oddities to get used to (there is no option yet to show just the total for the current task in the status item), but with single-click toggling of the timer, direct editing of totals, minimal system load and no redundancy, this is the one.