In this instructable I will show you how you can make your own Atting programming shield for the arduino and then use the arduino as a programmer.
Usually If you don't have a shield you can do a breadboard version to program the ATtiny. (Step1)
But here I'll show you how to program it and with a couple of components make a nice shield for the arduino, which makes programming much easier!
For more information on how to program the ATtiny click on: MIT High-Low Tech web page.
Hopefully you will be familiarized with the arduino environment, if not more info at Arduino.cc
And still, it's quite easy to set everything up.