Gmail has added lots of features such as integrating the Google Docs and Calendar in it. Also you can add more gadgets in your gmail account which is provided by Google.
Here is a quick tip on how to add links of Google docs documents directly in your gmail messages, the trick is provided by Amit from Digital Inspiration who perfectly make use Google products.

To use this, you need to activate the Google Docs and Calendar in Gmail Labs and simply drag and drop the document links into your mail message as just shown in the above image.
Note that this method only adds the link of your Google docs document.
Image Credit: labnol.org
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vijay@ambabo.com