Right click or command click.

It gets you this.
http://imgur.com/MQBv8.png

@johnpowell that doesn’t lock items in and prevent them from being dragged off.

@nashish You can but you have to enable Parental Controls under Accounts in system preferences. I think you’ll need to make another admin account and login under that to change your accounts parental controls.

http://img.skitch.com/20090908-pinkaasufdsek5qkfid58gnn5n.jpg

I’ve never really found it that easy to drag apps off my Dock.

@nashish Many timesI have accidentally dragged applications off my Dock,

I know just what you mean.

I once accidentally dated, courted and married the wrong woman.

(Thankfully I was able to amend that error. My current wife is fantastic and has been for more than twenty-five years.)

@justn I’ve read about using the parental controls to make the Dock unmodifiable, but I don’t think it’s serious enough for me to create a whole other account.

Anyway, I was just curious if there was a way to do that. I don’t drag icons accidentally off the Dock very often, but it’s annoying when I do, and I often don’t know what it was.