Denny's are a little sparse out here, so I don't know if I will be taking them up on that or not. (If I was still in SoCal, I could have hit three of them WALKING...well...let's say "bicycling" instead)
I immediately went to Dennys.com after the first commercial, and ... it was down. Once I got through, I found out the closest Denny's is 37 miles away. 75 miles worth of gas is about a wash to get a free breakfast that sells for $5.99. Add in the opportunity cost of time, and I will not be taking them up on their offer.
Also, 9/11 was done by Saudi and egyptian millitant nationals, and Somalia, Kenya, Algeria and Indonesia has suffered massive attacks, yet we go after Afghanistan (understandable) and Iraq, whose secular government has no love for Osama.