I know people have posted their specs but i was doing a google search and found this.
http://deathknightbuilds.com/

To me this is awesome they have many people take their death knight and use different specs and try out the damage and tanking ability. This is awesome for anyone that runs multiple dk's in a group. It allows for one to be main tank and 3 or 4 be massive dps or a tank dps and a healer of some class. I am going to read more on this and do my own tests using the talent spec tree and calculations during this week since no wow during week. This is to find if there is a massive uber dps spec i can ad to tat site and share with fellow boxers. I mean i love blood for healing but as i got higher i realized that they arent that good for handing out the dps. So now that i am 80 on all 5 i need to make two perm tanks and 3 perm dps to conteract with my druid healer and 5 shamans. Ive actualy thought making the 5 into a massive dps 5v5 team. Think about it if i summon army of the dead times 5 its gonna screw with any healers and dps trying to attack you. Lots of mobs lots of dps and lots of interruption. Mixed in with mad dps to bring in the opposition one at a time and own them.