I was browsing WoW Insider last night and came across the Lichborne articles. For those of you who don't know what it is, its a column written specifically for Death Knights. This week's column discusses Death Knight enchants, both for DPS and Tanking. They've got a gemming guide, a pre-heroic gear guide, and a heroic gear guide, tons of useful information. You might want to check it out.
http://www.wowinsider.com/2009/02/08/lichborne-pve-enchantments-for-death-knights/#continued