Which breakout board ? Are there pull-up resistors on the breakout board for the i2c-bus ?
The way you connected it, is okay.
The n0m1 code uses it's own i2c library.
That will make things complicated.
You better should have started with a simpler accelerator.
I don't know it the difference between the MMA8453Q and MMA8453 will effect the behavious. You can check the datasheets yourself.
Have a look at Sparkfun : Triple Axis Accelerometer Breakout - MMA8452Q - SEN-10955 - SparkFun Electronics
That code is for the MMA8453Q. Could you try that ?
Read also this: http://arduino.cc/forum/index.php?topic=97468.0