snsrlog

Snsrlog is an application helping researchers/iphone
developers and interested users to record and interpret sensor data.
During the recording of gestures or movements one can label the data so that it's easy to distinguish the different parts of a signal at a later point. The user can create up to six different labels for each recording. Additionally there's a live view that allows the user to watch the data on a real-time graph. The application also offers iTunes integration for uploading the records to any computer.

Please note that continued recording of mobile phone sensor data (especially GPS) running in the background can dramatically decrease battery life.