The ACEduino 328 board contains everything needed to support the microcontroller.

The board can simply be connected to the USB input of a computer just like an ordinary flash drive by using a USB type A-B cable. The board does not need a separate power source when connected to the computer.

Features:

14 Digital Input / Output pins 6 of which are PWM outputs
6 Analog Input pins, with pin for Analog reference
Different communication lines available – UART (Rx, Tx), I2C (SDA, SCL) and ISP (MISO, MOSI, SCL)
On-board solder able prototyping nodes
32KB Flash Memory and automatic power selector between USB and DC power

Specifications:

Microcontroller Atmel,  ATmega328P-PU
Operating Voltage 5Vdc
Input Voltage (recommended) 7-12Vdc
Input Voltage  operating limits at 6.7 (min) – 30V (max) DC
Digital I/O Pins 14 (of which 6 provide PWM output)
Analog Input Pins 6
DC Current per I/O Pin 40 mA
DC Current for 3.3V Pin 50 mA
Flash Memory of the ATmega328,  32 KB of which 2 KB is used by boot loader,
SRAM of the ATmega328  2Kb
EEPROM (of the ATmega328) 1Kb
Clock Speed 16 MHz from Crystal Oscillator
USB connection for serial communication to a computer and to allow in circuit
programming of the microcontroller
External power supply jack for wall adapter
In-Circuit Serial Programming (ICSP) header
Reset Switch

All these features will help you explore
and enjoy the vast world of microcontrollers.