Ladies and gentlemen, start your engines. The Diablo III installation servers have gone live. The game’s launcher will make waiting for the install easier by telling the backstory of previous games as the game downloads.
Diablo III itself will go live at midnight PST, however, so don't expect to play right away after the game is fully installed.
Let us know how excited you are to finally play Diablo III 12 years since the second game was released.