Back in July, we reported on the sad news that The Undermine Journal, long a staple resource for WoW's Auction House enthusiasts, was closing down. In their corresponding blog post, they did mention that if they were working on an Undermine Journal 2.0, and hoped to have it up and running eventually. That eventuality became reality earlier this week, when The Undermine Journal reopened it's doors. The new site is still a work in progress--there's no EU support yet, for example--but they plan on having that ready to go by the time patch 6.0 arrives, so never fear.
I'm sure that news of The Undermine Journal's rebirth will be happily received by many, and may all of your auctions always be profitable. Welcome back!