This is what I used for power leveling. I dumped points into Blood until I got Heart Strike, then moved to the Unholy tree, then went back. This spec allowed for GREAT wow power leveling. Fighting 1-4 mobs at a time was a joke, I never had to stop.
I got the DK to 80 in a little under 4 days game time, including nearly maxxing my Mining skill, and getting Engineering over 200 at the same time.I was regenerating so much life for myself, that I rarely dropped below 85% health (often even when soloing elites) and I was killing stuff fast enough to level fairly quickly. I could have probably cut the time down significantly by skipping the Professions, but such is life!
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