The MEGA 2560 Board for Arduino:
This is a microcontroller board based on the ATmega2560. It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
The LCD Keypad Shield for Arduino:
This includes a 16x2 HD44780 White on Blue LCD module and a 5 push button keypad for menu selection and user interface programming. Fully assembled. On-line Arduino tutorial and example code. Compatible with Arduino Uno, Mega, Duemilanove. Uses digital pins 4 - 10, and analog pin 0.
The Arduino XBee board for Arduino:
It mates directly with the Arduino USB board and allows to wireless communicate over a modified ZigBee protocol using the popular XBee module from Maxstream.
The Sensor Shield V5 (new version) has the COM and I2C (IIC) ports separated,so that both ports can be utilized at the same time to increase the possibilities of use.It allows you to connect to various modules like sensors, servos, relays, buttons, potentiometers and so on.
1 Mega 2560
1 XBee Shield
1 LCD Keypad Shield
1 Sensor Shield V5