The Skyrim 1.9 title update has been released and with it comes the ability increase player level beyond 81.
Skills of 100 can be made Legendary, resetting the skill to 15 and returning its Perks to allow the skill to affect levelling again. When resetting back to 15 an imperial dragon image is placed under the name of the skill, with further dragons added for each reset.
Because of the uncapped perk and ability points there's a new Legendary difficulty mode to test your skills.
1.9 also addresses a lot of bugs.
All this should also be coming to Xbox 360 and PS3 later this month.