We set up a four player LANin the spare bedroom, along with a fridge full of beverages and an air mattress should we ever decide to sleep. We got a few levels, four-manned some instances, pwned some n00bs*, and laughed a lot. I wasn't sure what to expect. He was a good guy in game, and I had my trusted companions along with me if anything went awry. It's definitely an experience I wouldn't mind repeating.
Have you ever met any of your WoW buddies outside of game?
* As we were running into Uldaman, a full group of the opposite faction tried to gank us. Even they out-manned and out-leveled us, we still took them down. It was beautiful.