Yes you will need to uninstall beta iTunes and delete the iTunes file from "music" on the computer (otherwise you'll get an error code on iTunes upon installing)I am thinking of downgrading from iOS5 but have a couple of questions first - hope its ok to use this thread.
1. Will I need to uninstall current iOS5 iTunes and install regular iTunes first?
2. Can I backup iPad 2 and iPhone 4 from iOS5 and install latest public release of iOS - then restore from backup?
3. Can latest iOS be jailbroken on both iPad 2 and iPhone 4.
4. If not, can I put iPad2 and iPhone4 back to last jailbreakable version - and what is it?
Any help would be greatly appreciated.