If I remember correctly, all you need is PC, Mirror's Edge game for it and some cheats. But I don't recommend. Game is much better in 1st person view.
Chat with our AI personalities
3rd person Team tactical.
-Saif
Um I think there is a game play that it is called "Third Person Cage Match":)
This applies on not just Minecraft 1.6.1, but all versions of Minecraft prior to the update of 3rd person. To get off 3rd person, you must press f5. You may then go into a different angle. Press f5 again and you'll be back to 1st person mode.
If you are playing Minecraft Classic, they don't have 3rd person mode. EDIT: Also, if your computer OS is Windows 7, you cant use F5 or any of the other F keys. Hopefully this will be fixed.