gDoc Signer for Google Docs enables you to write your signature on a wide variety of Topaz signature pads, insert it into your document, and resize it to fit your document requirements.  

gDoc Signer is part of Topaz  Systems “eSign Ecosystem®”, which brings together the widest range of integrated technology, intellectual property, distribution, reseller, technical support, service, and ISV third-party application elements in the industry. Topaz provides “electronic signature solutions for wherever business takes you®”.