Official launch of the PVP Deathknight blog!
First post will be stats to get for your unholy DK.
Strength - Always top for dps.
Hit - Are you 5% capped?
Haste - The next best stat out there.
Crit - Not the greatest (reforge to haste unless you need more hit)
Resilience - This should be your choice above all other ratings since its only from pvp gear and can't be reforged. With the way dks are being nerfed with the next patch i would get as much as this as you can, because a dead dk is no dps at all.
For gemming i would go mostly strength as you get the most bang for your buck there. Strength/Haste is a good choice for yellow sockets if the bonus is worth getting (strength or resilience). For your blue sockets gem Spell Penetration. You need 195 to be capped, so 4 50 spell pen gems will get you capped (3 with cloak enchant work too, more on that later).
I'll put up a enchant list and BiS list for your pvp needs later on.