(Google ) Gmail has also added the ability to insert images in line with your text, see profile pictures of contacts in autocomplete as you type in recipients, and drag and drop addresses between to, cc and bcc boxes.
Gmail introduces 'Compose' windows
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NOVEMBER 01, 2012
Leslie Meredith, Senior Writer, NBC News

Compose windows will now pop up in Gmail, so you are able to reference another message without having to save the email draft you're working on, open an old email and then reopen your draft.
Read more: NBC News