Try a Wrath of the Lich King talent spec on for size

Blizzard is making it easy for you to start planning for the launch of World of Warcraft's Wrath of the Lich King expansion. The official WoW website's talent tree calculator now represents the current WotLK build's talent trees for all classes, including the new Death Knight prestige class.

You can try on all sorts of new specs taking into account the talent tree changes and new abilities coming in the expansion, which is due out later this year.

The most interesting aspect to this is the ability to really explore in detail what kinds of abilities are available to the Death Knight. The information has been public for a while but if you haven't been following every single interview, it's cool to be able to go to one place and interact with what's there.