Bizzard Account

From Blizzard's New MMO Wiki

Blizzard released its Blizzard Account system in 2008. This service allows people who have purchased Blizzard Products (particularly StarCraft, Diablo II, and WarCraft III and their expansions), to download games they have purchased, without needing the CD. Soon, it will store a player's "Blizzard Level" (similar to a Gamerscore), when World of Warcraft's Achievement Points get added to the system, and expanded with future Blizzard titles, like StarCraft II and Diablo III.

Most recently, Blizzard has stated that all current World of Warcraft accounts will have to switch over to "Battle.net Accounts" by November 11, 2009. Failure to do so will prevent the user from logging in until the switch has occurred. Players that do this or have already switched to a "Blizzard Account" are being given a free in game penguin pet.