Download
https://us.battle.net/account/download/index.xml

We're pleased to announce the Diablo III open beta weekend, which offers open access to all players with a valid Battle.net account! Beginning this Friday everyone is invited to log in and help us put the game and servers through their paces in this three day stress test as we march toward the game's release on May 15. You can begin downloading the Diablo III client right now!
From Friday, April 20 at 21:01 CEST, until Monday, April 23 at 19:00 CEST you'll be able to log in, team up with friends, and play each of the five heroic classes to level 13 as you fight to save the world from the impending demonic invasion.

What steps do I need to take?

Log in or create a Battle.net account at http://www.battle.net
Create your BattleTag™, which is required to play Diablo III (What is BattleTag?)
Download the game client, install, and play between 21:01 CEST April 20 and 19:00 CEST April 23

I don't have a Battle.net account — can I still play?

Absolutely! Just visit http://www.battle.net to create a free Battle.net account. Next, download the client from https://us.battle.net/account/download/index.xml and install it. Create your BattleTag, and then log in to the game using your Battle.net account name (email address) and password to begin slaughtering the demonic hellspawn that dare stand in your way.

was going to try it, but i didn't agree with the agreement, specifically the words MONITOR and UPLOAD. too many cheaters for me to even bother with it.

decided to try it on my Inspiron Duo. i doubt it'll play, but i don't have anything on it that i have to worry about them monitoring or uploading. i don't care about the cheaters. i care about the fugging stuff i have to put up with because somebody is trying to keep them out of the game. it's a silly game.

i get some kinda error about creating a D3D device on my Inspiron Duo. thanks for hogging my bandwidth for 7 hours. may you have nice day.

so what is Diablo III like? I was thinking about getting it.