Tutorial: Using AVR Studio 5 with Arduino projects

http://www.engblaze.com/tutorial-using-avr-studio-5-with-arduino-projects/

This article explains, step-by-step, how to set up the AVR Studio 5 IDE for use with Arduino projects. It also includes some background on the pros and cons of working with AVR Studio, notes on general setup for working with Atmel devices, and a few other tips we’ve picked up along the way. Feel free to skip around to the sections that interest you.