Update 1: You can still use Redsn0w 0.8 as per the tutorial from July 2nd post below. This according to the folks over at the iphone dev team.Apple released iPhone OS 3.0.1 as expected and it patches the Text Hack Vulnerability highlighted this week at Black Hat. If you are not jailbreaking your phone - then you should go now and update to 3.0.1 - It is available by checking for an update in iTunes with you iPhone connected. And yes the Tethering Hack from help.benm.at - still works just fine. Multiple confirmations on that.
For those that are jailbroken -
read this over on QuickPwnMore info to come on the jailbreak side of things.