The Dev Team has released redsn0w 0.8 jailbreak program that offers the iPhone 3G.
So now the guys can buy the iPhone 3G quiet around here too.
How to jailbreak is like the other times.

You find the Redsn0w 0.8 for Mac at this address HERE .
You find the Redsn0w 0.8 for Windows, this address HERE

This new version supports all devices, both iPhones and touchs.
Here a brief tutorial step by step jailbreak.

Purplera1n Jailbreak iPhone 3G now tbm for Mac, now out of the oven's program Geohot ( purplera1n ) now for Mac OSX

The process itself is largely the same, but stay tuned, here's a video posted earlier

Dev-Team Releases ultrasn0w style - in 3G Jailbreak

Taking the cue from purplera1n which was pronounced by little, the Group Dev-team released the UltrasnOw, which makes the TBM Jailbreak and unlock (unlock) so it is more complete, but so far is only available to developers in version hackers on call test awaiting publication.

check out a video below;