I always downshift to stay in a gear that pulls well as I stop, and keep an eye on the cellphoning, eating, reading, playing with the radio idiot behind me. I also always leave it in gear whilst waiting for a green light because you never know what might happen that will require a quick move. Sometime ago, someone posted a link to a video of someone getting run down because he was in neutral and sitting with his shifting foot on the ground.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python