The gates to Northrend are open – to the lucky few who have gotten invites into the beta. For the rest of us, the best we can do is follow along on sites like, oh, here, as well as WotlkWiki and others. Now there's one more to add to the list: Wowhead has opened their Wrath site, with details on hundreds of items, quests, spells, and more, as well as the talent calculators we've talked about before
One of my particular favorites is the beta patch notes, which are nicely formatted and have links to all relevant spells, abilities, talents, and items mentioned in the notes (super-handy). New data updates are coming in all the time. There are many neat and yet-undiscovered things to be found there, so take a look around, and let us know if you come up with anything interesting.