Hardware & software:
- Understudy at http://code.google.com/p/understudy for free from Leo Laporte.
- Qstarz GPS Recorders
for various models/prices from Leo Laporte.
- iStat System Monitoring for iPhone (desktop version: http://bjango.com) for $1.99 from Andy Ihnatko.
- Analytics App for iPhone for $5.99 from Frederick Van Johnson.
- Trails for iPhone for $2.99 from Don McAllister.
- MotionX GPS for $2.99 iPhone for from Andy Ihnatko.
- at for from Don McAllister
Books:
from Andy Ihnatko.