Guide , how to use V-USB

Hello , I'm interested in how to use and make work V-USB on Arduino Atmega328 chip , and connect it to the computer without any bridge ( atmega 8 ) . I would be very greatful , if you give me step by step tutorial or something like this . thank you in advance

Google says:

http://codeandlife.com/topics/v-usb-electronics/
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=116387
And more.

right now I'm using arduino IDE and , how to include the V-USB files in my project >?

did you get any useful answer or do you have a working project
for Arduino-IDE >=1.6.x , 329p , 16MHz ?