Google Aps admin can now automatically collect user name from the form submitted by the users on their organization. To do so, follow these steps

1. Sign into Google Apps.

2. On the Google Aps dashboard, choose Google Docs.

3. When Google Docs opened, go to menu ‘New‘ -> ‘Form‘. Click on the ‘Automatically collect respondent’s user name‘ check box at the top of your form. When the form is saved, a new column called “Username” will be added to your form’s spreadsheet. The user’s’ user names will appear there.

notes: this is for Google Docs in Google Aps only, available to all Google Aps version.