Gmail team has recently launched another great feature which allows you to save the attachments from gmail to your desktop computer hard drive just by drag and drop to the folder where you want to save the attachment in that mail. This way it becomes more easy to save the attachments and use much less time in saving an attachment, this feature is just reverse of the a feature added to gmail which allows to add attachment in gmail just by drag n drop over the gmail interface.+
We have just tested this feature works with google chrome only as if now, hopefully it will be functional soon with other browsers like Internet Explorer, Firefox etc.+ In to save an attachment from gmail mail. Simply click and hold, then drag your cursor to anywhere in your file system that you want to save the file. Release the mouse button, and voil�! Your attachment is saved (for large files, you may see a progress dialog).
[ Source � Official Gmail Blog