On the other side of the coin, runic power wow gold is easiest to imagine along the lines of a Warrior's rage: It's a bar that starts out empty, and fills up as you use special abilities. Some of your abilities will get more powerful with the more runic power you have to unleash; in this way, the system is also similar to combo points. There are tons of abilities that only cost runic power. Lots of the "finisher" type abilities fall into this category: Think the Death Knight's equivalent to Eviscerate or Mortal Strike. Others play with the resources a little bit; the Gargoyle you can summon will hang around as long as your runic power holds up.

Runeforging, finally, seems to be what the original vision for the rune resources evolved into. Think of them as free weapon enchantments that only Death Knights can use, and only then when they're near special sites called runeforges. The coolest one is called Fallen Crusader, which works like the old Crusader enchantment: Your weapon attacks have a chance to proc a small heal over time effect with a boost to your strength stat. Others do more wow gold subtle things, like deflect spell damage or increase your parry chance. The drawback to runeforge enchants is that they'll overwrite any regular enchants on your weapon -- even the super-expensive ones. So you could probably assume that once you have access to the best endgame enchants, you probably won't be runeforging all that much, unless they change the system somehow.
Prior to playing in the beta, we were under the assumption that the Death Knight's ability schools corresponded tidily to the class's different potential roles. Ie, that Frost was the "tanking tree," Blood was for PvE DPS, and Unholy was for PvP. We now know that it isn't that simple; you can do really well in PvP with Frost-heavy specs, tank decently with lots of points in Unholy, and focus on Blood without necessarily being able to top the damage charts.

The overwhelming feeling amongst the community is that the Death Knight is too young to benefit from the "theorycrafting" foundations that the legacy classes enjoy. While we fully expect a body of knowledge to emerge shortly after millions of players roll millions of Death Knights and put its abilities, talents, and mechanics wow gold through the motions, the early weeks in Wrath of the Lich King will probably be defined by a whole lot of experimentation. Enjoy it; you're probably familiar with how easily it is to get pigeonholed into specific talent specs depending on what your guild, raid group, or arena team expects of you. Your grind to 80 should be all about figuring out how to be effective while maintaining enjoyment of all that this new class has to offer.