I am using whatsapp web application from last 6-8 months. Its really a nice way where you can use your whatsapp directly on computer without any usb cable. Its look good to use whatsapp application on computer. For using whatsapp application on computer you have to connect your computer and mobile both on one network and type "Whatsapp web" on your web browser.
A windows open having some QR code there you just have to open your whatsapp on moblie and choose option whatsapp there an your camera get open, now capture QR code from your computer and your whatsapp get logged on your computer. I love to chat with my friends from computer as it work fast and a big screen enhance its beauty.