Fish, you provide lots of good info on your blogs and you've helped a lot of people.
As someone who works for airlines and airports (security systems, baggage systems etc)and has done it for 20+ years I have 2 things to add:
1 - Common Sense tips as handed out by seasoned travellers like Fish are MUST READ.
2 - Every airport and every airline and every country is different and has different technology and different rules. Be prepared for what you thought to be true to be false.
For example, on trip to Beijing in January, I was told to remove all locks from both my carryon and my check baggage. 
?
