The Core Motion APIs give you the following timestamps for activity: running, walking, completely still (phone on the table), and "unknown" (either fidgeting, o

The Core Motion APIs give you the following timestamps for activity: running, walking, completely still (phone on the table), and "unknown" (either fidgeting, or a few seconds before the chip realizes you're doing one of the other activities). I'm sure it's a step towards an iWatch.