Atmel’s hardware platform product line comes up for Atmel ATmega328P microcontroller in the form of the evaluation kit Xplained Mini version. The kit solely design for the purpose of the evaluation of the Atmega328P microcontroller features and leverage its capability in quick prototypes and evaluation projects. The kit is USB powered and features highly integrated debugger for working with latest version of the Atmel Studio.
The kit is designed with minimal form factor for comprehensive access to the features of Atmega328P, the arduino shield is well supported with this kit. Along with that, the kit features the onboard switches and LED for quick prototyping.
Features:

On-board debugger with full source-level debugging support in Atmel Studio.
Auto-ID for board identification in Atmel Studio 6.2
Access to all signals on target MCU.
One green status LED
One mechanical user pushbutton
Virtual COM port (CDC)
16MHz target clk
USB powered
Arduino shield compatible foot prints
Target SPI bus header foot print
Xplained Pro extension headers can easily be strapped in
Supported with application examples published on Atmel Spaces

Relevant Resources:
ATmega328P Xplained Mini User Guide