arduino diecimila to arduino mega 2560 conversion

I am just starting to run through the learning section for the Arduino Mega 2560 system.When I go to the 'Learning tab for this board, I could not find any of the examples that were for my board. I also could not find a pin conversion that I could use to convert the example board, the Arduino Diecimila, to the Arduino Mega 2560 board. Can someone tell me how to do this.

Most of the code for Arduino Diecimila are able to used in Arduino Mega 2560 board without change, except some special Pins function which need to change like SPI, PWM, I2C TWI. I2C / TWI