To embed a document into an email
Open the document you wish to send
Choose Email as an Attachment
You will see a pop up menu
Choose Paste the document itself into the email message
Some email clients do not show images or embedded html pages so to be sure everyone can see it, publish the document and include the URL and a message letting the recipient know that if they cannot see the document in their email to click on the URL
This tip was found in the Google Docs How To Group courtesy of the awesome Ahab!