1) People do not look where they are walking. This isn't just an issue in the shops either. They tend to walk aimlessly doing other tasks with their eyes averted elsewhere. They don't look up until they are bumping into you.
I am going to be a grumpy old woman now and blame the ipod.
In my day

people were alert and paid attention to who was around them. They listened to footsteps behind them or near them.
I was always taught to pay attention to my surroundings and the people around me, for my own safety.
Now, people seem to be in their own little worlds, completely oblivious to those around them until they are about to run smack into them.
I must admit I am constantly daydreaming, but there is always a part of me that is very alert and aware of what is going on around me.
There have been so many times people have almost walked into me and then had this shocked expression like they are amazed that there is another human being on the same street as them.