Mine does the same, not very noticeable until around the 1,000 mile mark, very noticeable now. My current theory is the Throwout Bearing, guy I know at the dealer also concurs. It does appear to be a "normal" part of the drveline slack issue, and nothing to worry about.
It is very annoying though.. I have learned to be a little smoother when loading/unloading the drivetrain around parking lots, ie cruise nights, etc, don't want to alarm bystanders!!!
