DK specs

These are the specs that i personally use, i suggest you use them to make your own and not just copy them.

PvE
This is a decent blood spec that centers around heart strike, obliterate, and death coil as your main DPS. Great for leveling since it allows you to kill quickly and kill with no downtime what so ever.
http://www.worldofwarcraft.com/info/classes/deathknight/talents.html?tal=2305020530033313231051010003052005030000000000000000000230200000000000000000000000000

Now THIS was my leveling spec, minus the gargoyle (but that thing is awsome for elites and bosses), AoE dmg like a mofo, very little to no down time as long as your use death strikes while your dots eat everything. I could rock 5-8 mobs at a time and go right back to it np with this one.
http://www.worldofwarcraft.com/info/classes/deathknight/talents.html?tal=2305020500000000000000000000000000000000000000000000000230200335103115203150003130151

And here it is, stop asking me for it! the one, the only, my tank spec
http://www.worldofwarcraft.com/info/classes/deathknight/talents.html?tal=0055000500000000000000000003250505100510110301205131300035000000000000000000000000000

And this here would be my PvP spec, alot of people like unholy cause you get the pet and you coem back blah blah blah I just don't want to die, so poof i am blood. after two death strikes you can spam 6 heart strikes that is 6 freakin cleaves, GG 2v2s not to mention the free 100% crit death coils you get from those 6 HSs
http://www.worldofwarcraft.com/info/classes/deathknight/talents.html?tal=2305020530033313201050013003050505100000000000000000000005200000000000000000000000000

Like i said don't just copy these unless you really want to, these are suggestions.