How to re-create Site Summary Page

If you ever delete the Site Summary page and want to recreate it, do the following

1. In the Home Area click "Change Settings". Go to the "Page" tab and select "SubAreas can use any template"
2. Click OK
3. Then click "Manage Portal Site" and click "Create Area".
4. Enter the details for your new Area - and select "Site Directory Area Template" from the Template Selection box.

And you're done.