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Death Knights are the only class that can legitimately tank out of any tree they want. I am going to share with you two of the better builds from the Blood and Frost trees for tanking. There are infinite builds but these have worked well for me in the past. There are commonalities in talents though no matter what tree is your primary, such as 5 points in anticipation and 5 points in Toughness. 5 points in Blade Barrier too is usually recommended.
Death Knight Blood Tanking
56/5/10
http://www.wowhead.com/?talent#jcEGVh0Icbofssx0xZ0gh:pdiV0M
This tanking build will work for AoE aggro or single target boss tanking.
For single target you're going to start off with an Icy Touch, Plague Strike, Heart Strike, Obliterate, Heart Strike. If you want your diseases refreshed you should swap in Pestilence for one of the Heart Strikes when possible. If you want to heal yourself somewhat on a fight swap obliterate with Death Strike. Other than that, don't forget a bout your cooldowns which can help you hold aggro at start like Hysteria.
For AoE you start off with Death and Decay and do an Icy Touch Plague Strike Pestilence rotation. Use Blood Boil and Death Strike in the meantime, pestilence when you need to refresh diseases.
Death Knight Dual Wield Frost Tanking
8/55/8
http://www.wowhead.com/?talent#j0xhZhxe0A0I0c0fuuAo0xh:pdTVmM
The Frost Tree for tanking allows death knights the ability to dual wield and tank. The build above works great for AoE and will do well in Single Target if desired. To make this more of a single target type build replace death and decay with anything that adds to your single target damage, like Bladed Armor in the blood tree or Ravenous Dead in the Unholy Tree. Posisbly Epidemic in the Unholy tree if you don't want to use pestilence to refresh diseases as often.
The AoE Tanking Rotation then is simply, Death and Decay if you prefer, or Howling Blast, Blood Boil, Plague Strike, Icy Touch, Pestilence with Rune Strike's when possible and Frost Strike to dump extra runic power.
The Single Target Rotation is Icy Touch, Plague Strike, Blood Strike, Death Strike (or Obliterate depends what you want to do), Blood Strike
If you want to spread disease throw in a pestilence in place of a Blood Strike.
Death Knight 2h Frost Tanking
10/53/8
http://www.wowhead.com/?talent#j0xGZhxxLA0I0c0buuAo0xh:pdTVmM
This moves points out of dual wield talents and gives you some points in 2handed weapon damage increase and some haste form Icy Talons. The same thing applies to this as the build above, if you want to go toward more single target type encounters change out some of the AoE Talents.
The Rotation is also the same as above.
