It was just under a week ago when the bootloader for the HTC One X for the AT&T network was unlocked, now it just gets better. XDA developer kennethpenn has released a 1-click tool that will unlock the bootloader for the HTC One X version for AT&T and Rogers users. This will allow developers to create more stable ROMs allowing owners of the One X to customize the phone to their hearts content. The instructions and files needed for the process can be found in the second source link below. Remember by fiddling with the bootloader you could permanently damage your device, you’ll be doing so at your own risk, happy modding!
Source: XDA-Developers, XDAForums