Whatsapp Officially Comes To Laptops And Desktops

WhatsApp Web
Today, for the first time, millions of you will have the ability to use
WhatsApp on your web browser. Our web client is simply an
extension of your phone: the web browser mirrors conversations
and messages from your mobile device -- this means all of your
messages still live on your phone.
To connect your web browser to your WhatsApp client, simply
open https://web.whatsapp.com in your Google Chrome browser.
You will see a QR code --- scan the code inside of WhatsApp, and
you’re ready to go. You have now paired WhatsApp on your phone
with the WhatsApp web client. Your phone needs to stay connected
to the internet for our web client to work, and please make sure to
install the latest version of WhatsApp on your phone. Unfortunately
for now, we will not be able to provide web client to our iOS users
due to Apple platform limitations.
We really hope you find web client useful in your everyday lives.
http://blog.whatsapp.com/614/WhatsApp-Web