Application for on-boarding employees

Using a list and a workflow to create tasks for those people who need to perform an onboarding action is a good approach.  You can track who has the outstanding task and follow up if necessary.

To be clear, a custom list that receives the initial entry of who the new employee is and things they need (AD account, PC, door badge etc represented as check boxes).  When the item is saved, a workflow will fire creating the necessary tasks for the people responsible for the items checked.  This way you can track all the tasks assigned to that new person to make sure they have all been done.