Source: Drag and drop attachments to save them to your desktop - Official Gmail Blog
Now, drag and drop attachments from your gmail email. It becomes even easier to save attachments quickly and efficiently. Along with google multiple in option these new features takes gmail to a new level.
I must mention here that gmail is the only email service which allows Video chatting as well. If you don't know then, try it! google chat will ask you to download a video plugin, search on google for google gears. After you download it you are good to go.