Searched "Weather London" on an iPhone this morning. Got this clear and simple interface, where you move a slider to see how the sky changes from early morning to tonight. Some rain expected, but not until 8pm. Good, I'm going to cycle to the office.
Nothing revolutionary, but exactly what I need for my daily use. Great products are not necessarily packed with innovations. Making existing things work better, more accurately useful and usable, can be as exciting and rewarding as the act of creating something totally new.