I tested it out, and it works for both Google Apps GMAIL users and regular GMAIL users.  You can also attach multiple files as well as single files. However, folders full of files does not work.

As mentioned earlier, the new feature only works for Chrome and Firefox users. So IE and Safari – sorry, you’re outta luck for now. Drag and drop attachments onto messages [via theGoogleOS.com] Comment Name * Email *

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