The Tattoo just got a Rom update via HTC. This is for users on the Orange network. To get the update you will have to manually install the Rom using your windows computer with HTC Sync. remember like every other manual update this will wipe your phone. So make sure to back up all your info and apps because they will be erased. For all the info about the update and instructions you can head over to HTC site.
Source: HTC
