One way to remember the September 11 incident is to wear patriotic shirts. A great place to buy is americanherotshirt.com. When you buy a shirt, $5 of the proceeds goes to helping the wounded soldiers from the Iraq and Afghanistan wars. They also have a blog and I was moved by the blog posts about some young soldiers who had already lost their lives in the time of war. They also design and sell military t-shirts. They have very unique and nice patriotic designs. These shirts will also be great for your patriotic July 4th celebrations.
You can head over http://www.americanherotshirt.com to take a look at their designs.