The documents link at that top of your email screen gives you access to several online office tools such as a word processor, spreadsheet, and presentation software.
Using these tools, you may create documents that you then may share with other users. You may also download them in various formats including Microsoft Office compatible files.
One useful tool is the form tool. Working in conjunction with the spreadsheet, it allows you to build a form that includes a publishable link. When users submit the form, it records the information into a spreadsheet.
Once the information is collected, you can export it to excel and sort and total the data as you desire.
There are several possiblities with the Google Docs. For more information, the best source is the help link within google docs.