Good idea for conference evaluation forms

My business partner Don writes to tell me about a good use for SharePoint:

Now here’s a cool feature Microsoft implemented in their conference SharePoint communication site. Instead of passing out paper evaluation forms, your badge (a proximity card) is scanned when you enter a session. When you get back to your hotel and log onto the conference site, there is a list of online evaluation forms just for the sessions you attended and have not yet filled out an evaluation form.