Gmail is now offering an exciting new feature. You can now drag and drop attachments directly into a message when composing a new message. You can also insert a calendar invitation directly from the compose window in Gmail.

Instead of selecting “Attach a file” drag the file into the compose window to attach the file (currently available for Google Chrome and Firefox 3.6). To insert the calendar invitation, compose a new message and click on the new link “Insert: Invitation.” A small window will then appear that displays your availability as well as that of the people you are emailing as long as you have permission to view their calendars. Click “Insert Invitation” and this adds a preview to your email message. Sending the message adds the event to everyone’s calendars.

Please visit the below for further details:

http://gmailblog.blogspot.com/2010/04/drag-and-drop-attachments-onto-messages.html

http://gmailblog.blogspot.com/2010/04/insert-calendar-invitation.html