Arduino on Xcode Project — Official Thread

HaakonStorm:
Tim: How does A*.app 1.0 seem to have changed from 022?

Those are documented in http://arduino.cc/en/Main/ReleaseNotes

    • The WProgram.h file, which provides declarations for the Arduino API,
      has been renamed to Arduino.h. To create a library that will work in
      both Arduino 0022 and Arduino 1.0, you can use an #ifdef that checks
      for the ARDUINO constant, which was 22 and is now 100. For example:

#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif

  • The avrdude included with the Mac and Windows versions of the Arduino
    software has been upgraded to avrdude 5.11 (from an Arduino-specific
    version of avrdude 5.4). The software now uses the "arduino" programmer
    type in place of "stk500v1" for uploading to most Arduino boards.

etc..

good luck with that!

best,
tim.