I have just upgraded to 10.6.6 and App Store has installed itself on the Dock. I wish to remove it from the Dock as (a) I am unlikely to use it, and (b) I don't want a cluttered Dock. However whenever I drag the icon off the dock and it disappears in the traditional cloud of smoke, the next time I start up the computer the icon is back on the dock. How can I get rid of it permanently? Thanks.