Salesforce.com has a concept of Communication Templates that allow you to create "templates" for emails that you can send via salesforce.com. These email templates can have dynamic code in them, that allows you to email a link to your survey and have the data posted back to Salesforce.com.
On SurveyAnalytics
    
    On Salesforce.com
    
    
    Now when you want to email a link to the survey:
    This feature is available with the following licenses :