BigBoss posted an article today stating that there is currently no jailbreak for firmware 3.0 (the real thing, not the betas). Yes, you can use the 3.0 b5 jailbreak tools but, it’s not advised. Below is what BigBoss has to say on the matter.

As for the rest of us who are not on firmware 3.0 yet, they will probably have it jailbroke before we even get it on June 17th. However, even if they do have it jailbroke by the release date, there is rumor that many of the jailbreak apps will not work on firmware 3.0. Doug says apps like WinterBoard, WeatherIcon, LiveClock, Cycorder do not work on firmware 3.0 b5. So, on June 17th, you might want to hold off on upgrading until we can figure out how everything works. We will keep you up-to-date.

“Yes, 3.0 GM is released to developers. This is the final 3.0 release. There is no jailbreak for it at this time. Do not yet upgrade. There are rumors of people using the 3.0 b5 jailbreak tools. This is a terrible idea. It will replace most your 3.0GM with B5 components. You will not have a real 3.0 final any longer, instead you will have a hybrid 3.0 and beta 5. It’s a terrible idea. Next week when beta 5 expires, your 3.0 jailbreak could expire as well and you would have to restore all over again.Yes, some people may claim that they did this and “it works fine”. But as I just stated, it is not a real 3.0 final any longer. Definitely not a good idea nor is this something you want.

Just wait a few days and you should be ok.”

You can check out the post on his website HERE.