Google announced today there are two new additions to forms which make harnessing data collection through the web easy - page breaks and logic threads in forms.  What this means is that you can create a form with multiple pages and then apply form logic as to what page to display next based upon previous responses.  For example, a survey can ask a question with a response of good or bad - the path for a good response may be a thank you page while a bad response continues to ask for further response or an open answered text box for further comments.