It is STILL NOT a software hack! This one revolves around something called TurboSIM. It supports all kinds of SIMs not just V1 SIMs. For more information go to:

http://www.iphonestalk.com/iphone-unlocked-for-all-use-any-sim-card-in-your-iphone/

and here is how to do it:

http://www.hackint0sh.org/forum/showthread.php?t=2619

or

http://www.jasonmadigan.com/2007/08/13/turbo-sim-iphone-unlock-confirmed-working/

Enjoy :) and this time, no need for SIM card programmer devices or Silvercards!