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BitLocker To Go was previously only available in Ultimate and Entrprise Windows editions. With Windows 8 it will be available with the mainstream business SKU, Windows 8 Pro.
If you forget the password for a flash drive protected by BitLocker To Go, your data is lost for good. Unless you can come up with a recovery key, that is. Windows 8 builds in the option to save the recovery key to your SkyDrive account, where it's secure but readily accessible.
When you plug a BitLocker-encrypted flash drive into a Windows 8 PC, this Metro style dialog box prompts you to enter the necessary credentials to unlock the data. (BitLocker To Go is also compatible with Windows 7.)