The thing with sparklines is that, while curves seem to hold a certain fascination with a lot of people, I just don't see all that much utility in them, certain

The thing with sparklines is that, while curves seem to hold a certain fascination with a lot of people, I just don't see all that much utility in them, certainly not in my iPhone usage. For stock prices I consider curves less than useful, since it's natural but generally foolish to want to extrapolate from them. For temperature, I may want the highs and lows and perhaps a general trend (derivative), but a sparkline offers only a very low-fidelity version of that information.