DevTeam‘s MuscleNerd has demonstarted a video for iPhone 3G being soft-unlocked with yellowsn0w.

MuscleNerd’s Qik account that has some preliminary information that relates to his AT&T SIM card.There is a VNC session that you can see in the background so that all details would be provided properly.
It claims that the trick/software would be available from the eve of Dec 31.
Check the video

I got an iPhone 3G as a gift from my best friend. This phone is the best phone that i ever had, great style and great features. I luv my iPhone 3G.
*.
iPhone 3G is simply the best phone that i have owned. It is very stylish and its nice features. I also own an N97 but i like the iphone.
the iphone 3G looks cooler and stylish than blackberry”-”
i love the iphone 3g compared to blackberry or even the google android phone*`.