On my travels recently, I took out my laptop from my backpack everytime I went through security at airports, but didn't bother taking out my phone, iPod, or my 2 cameras. Nobody said a word.
In fact on one occasion, at SIN, I accidentally left a big bottle of sun cream lotion in my bag, and this also got through the security scanners no question asked.
When I noticed this in my bag after the check point (at SIN, the body scanners, bag scanners etc are just before the boarding gates) I got a little nervous so I just took it out of my bag and left it on a seat!
This bottle of suncream lotion could have been carrying anything! I thought no liquids were allowed on a plane (unless very small quantity)?