In the aftermath of one of the biggest patches WoW has ever seen, many realms are still experiencing some technical issues. Talents and items are going missing, world and instance servers are down, and I've heard at least one report of trash mobs in Naxxramas suddenly breaking out in song.
Okay, I might have made that one up. The point still stands: problems exist in the realms right now. Blizzard knows this too, and they've decided to keep their technical support department open today until 7 PM Pacific time (10 PM Eastern). Usually they're only open on weekdays. Support will be available over the phone, through email, and in the tech support forums, as usual. Eyonix has posted a list of the methods to contact tech support, so check it out if you're having problems.