Blizzard has announced that starting April 4th and running for one week, they will begin taking applications for the Lord of Destruction add-on for Diablo II (thanks PlanetDiablo). Like the original Diablo II beta, the version of the game that will be released to testers is playable only over Battle.net, although it includes everything but the endgame cinematics from the retail release. More information can be found at Blizzard's official site, where they have posted a Lord of Destruction Beta FAQ.