Airline Carry On Rules

I review the carry-on container regulations upon continental.com (http://www.continental.com/web/en-US/content/travel/baggage/carry-on.aspx) and we got confused…
it says which we can have a single carry-on and 1 personal item, afterwards it list what kind of personal object we can bring…
Does this meant which we have to select in between carrying my digital camera, mp3 player, and laptop?
At first, we programmed to have a single lift on-baggage, similar to a bookbag and have my laptop, mp3 player, and digital camera in there….so what should we do now?
Also if we move my laptop, does which meant we have to take it out to let it be indicate by the cat-scan appurtenance itself? (same thing for the 3oz toiletries?)

BTW, I’m roving from Newark, NJ (EWR) to Hong Kong (HKG) (it’s about a fifteen hour moody >.<)