Look up the EO he issued that ordered Union Dues not be used for campaign activities without the consent of the dues payer. That's one.
This Executive Order was not a reversal of a Clinton Executive Order.
It is very common for Executive Orders to be overturned by the court. However, the discussion is about Bush not over-turning many of the ill-advised Clinton Executive Orders. There is not a single instance of the SC ruling an Executive Order unconstitutional because it reversed a prior executive order. There is a very good reason for this - it's constitutional for the President to do this!