Do You want to Download iOS 4 free? Here you go...
1. Download iTunes 9.2 Beta.
2. Backup Device.
3. Download ipsw for device (links below, use firefox)
4. Hold Option or Shift and Click restore in iTunes once device has been connected.
5. Find firmware you downloaded.
6. It will start restoring!
There you have it guys! Free iOS4 early!