The Department of Homeland Security has created videos of Secretary Napolitano that will play in hotels and retail stores. They will start with 200+ locations and plan to spread it to 600 across the nation.
According to a Time News Feed article, there is a video for Walmart stores. The video has Secretary Napolitano asking shoppers:
"If you see something suspicious in the parking lot or in the store, say something immediately. Report suspicious activity to your local police or sheriff. If you need help, ask a Walmart manager for assistance."
If you visit the Mall of America, Amtrack, DC's Metro system, Walmart and other places you may see the video.
"Attention, Wal-Mart Shoppers, an Urgent Message from the Department of Homeland Security", Madison Gray, Time News Feed, December 7, 2010.