Visit 911day.org and join the 9/11 Tribute Movement (and read, see, and watch the tributes others have made). Here's what it says on the web site: "Please join the 9/11 Tribute Movement by briefly describing what you will do this year — a good deed, charitable activity, or other plans — to honor the 9/11 victims, survivors, and those that rose in service in response to the attacks."
Here's how it is done on the site:
1. Enter what your tribute will be. For example: I will honor my local firefighters by bringing them food.
2. Upload a video, photo, or simply fill out the 9/11 Tribute card.
3. Dedicate your tribute to an individual lost on 9/11, or another person, such as a first responder, recovery worker, or a member of the military.