Macbook Webcam light turns on for a second when computer is waked
It's possible you have installed, or someone else has installed, a system utility to capture the image from the iSight when opened. This is often something an anti-theft application might do, in order to track down the user of a stolen laptop.

One combination of utilities that can do this sort of thing is "sleepwatcher" 

You might check to see if there is a file at 

/etc/rc.awake


or an invisible file in your home directory called 

.sleep


If so, sleepwatcher is installed.