This is quick post which many of you find useful. For any one who has Leopard and uses stacks, a Trash stack may be very useful. Normally you can’t put a Trash stack in the dock since you don’t have access to to the Trash folder itself it can be quite hard to do, but there is a work around.
First open a new Finder window and press Command + Shift + G or goto to Go > Go To Folder. Then type ~/.Trash. You will then see a new Finder window. You can then drag and drop this folder onto your Dock.