A .nbh image file has been released that will allow you to downgrade your rc30 phone to rc29 which will re-introduce the root bug. Once there you can follow the steps to get root access, install the modified recovery image and flash JF's rc30 and keep root! The steps can be found in various threads on this forum, and also in my wiki.
To downgrade using this NBH file: http://android-dls.com/wiki/index.ph...=Root_For_RC30
To gain root access: http://android-dls.com/wiki/index.ph...ooting_Android
To flash the recovery and install modified rc30: http://android-dls.com/wiki/index.ph...e=Keeping_Root
Please remember this wiki is made and edited by users, not just me. Some information might not be written as well as it can, and if you find a problem, please feel free to login and correct it.
Good luck to everyone stuck on RC30 who wanted root, its finally here!
By the way, I got this info from disconnects site (gotontheinter.net) and I believe (might be wrong) he got it from here somewhere.