Page 16. last sentence: ‘You then turn the LED back on again’ should read: ‘You then turn the LED back off again’.
Page 8. In the section “Power Supply” I say that the Arduino can run for 40 hours on a PP3 battery. Actually this should read 4 hours.
Page 236. The sketch sketch_14_03_flashing_3″ on page no. 236 will not compile if you have version 2 of the Timer library. This has broken backwards compatibility, so until the library is fixed, please use this verion of the timer library.