IncGamers has word on the launch of signups for World of Warcraft players interested in beta testing the Wrath of the Lich King expansion for Blizzard's MMORPG, saying this is as simple as opting in to the beta test via your account page on the website, though apparently at the moment the European Account Page has the opt-in link, but it has not yet appeared on the US Account Page. Update: US Signups are underway as well.