Geohot failed to release it, but comex did. Here is the full guide.

Geohot did it again, this time with a nice video-proof. Apple’s heightened security with the latest bootrom in ipt2,3 and 3GS iPhones forced many to resort to tethered jailbreak which can be a pain when your iPhone decides to reboot on the go. A blackra1n like app should soon see the light of day for total freedom to all Apple mobile gadgets! Till then, check geohot’s post.