You readers are awesome -- yesterday, when I posted the link to the online server alert page (which, yes, wasn't all that new, but lots of us hadn't seen it before), I suggested that it get hooked up to Twitter somehow, and sure enough, Scyntinth and blkmasta55555 wasted no time creating @WoWStatusUS and @WoWStatusEU, respectively (Ed also pointed out the EU status page). Tsaavik created an RSS feed for the alert as well, if you'd rather use that. And those aren't the only way to track Blizzard's realm status on Twitter -- looks like @wowalerts has been in action for a little while, and @pikestaff pointed out to me that @wowrealms tweets about realm downtime as well. And, hey, even your friends here at WoW.com are on Twitter keeping you up to date with the latest at @WoWInsider.
So yes, there are tons of ways to track what's happening on your favorite realms via Twitter or any number of updating services.