A rather sophisticated phishing scam has been doing the rounds at Google Docs. Once the link is opened and access is granted to your account the message then sends out to all of your contacts which helped it spread quickly around the world. Google have apparently closed the accounts sending the original messages and are working to stop this from happening again but you can never protect a system 100%.
As per our usual recommendations do not click on a link within an e-mail unless you are expecting it, Even if you are expecting an e-mail and it doesn’t look quite right it is always best to check with the sender to make sure what you have is legitimate.