Very useful podcast which often gets overlooked by people.
One thing that wasn't covered which I have heard a lot from people (which I don't EVERY do myself) is:
"Oh, I better not shake your hand, I have a cold."
Personally, I think if someone is so sick they can't touch you, they shouldn't be touching the door knob either to come into the office. What would you do in this situation? I try to usually just say, "That's OK" and try to shake their hand anyway, but it is awkward whether you get to shake their hand or not still.