I just used redsn0w, it jailbroke my 3G phone just fine, but when I tried to launch Cydia, I got a flashing "Apple logo with progress bar", the same screen you see when you restore your phone or install a new firmware. I can't actually launch Cydia.
So instead, I'm performing a restore back to the factory 3.0
So instead, I'm performing a restore back to the factory 3.0