I've never found task apps that useful, and have generally resorted to the old technology: paper. But Finish for iPhone ($0.99), a new app out today, has changed that. It's a simple, yet very useful and handy to-do list for the iPhone. (No iPad version yet.) It has several features I like: time frames, automatically ordering your tasks according to time frame, and Focus Mode, which shows the most immediate tasks in each of the time frames.