If you play any of the Blizzard games, you should install the Battle.net desktop client.
The client is currently in beta but it works very well.
Download the client from here (EU English version), for US or other countries/languages, head to this link. I think that you need to be logged into your battle.net account to see the page.
The client looks like the Steam client or the League of Legends launcher interface. You get the idea.
The fun part is that you can set the client to auto-login you into battle.net. This way you can start World of Warcraft, Diablo 3, Starcraft 2 or Hearthstone, without having to login further from the game’s login screen.
Other that this, the client has a really nice interface, it has tabs for every Blizzard game. These tabs contain besides the “start game” button, news, windows with your online friends from battle.net and a few other interesting settings.
The downside is that when you start WoW or other Blizzard games, they will start with the battle.net desktop client, you won’t see the game’s default launcher.
What do you think about the client?