Portal Site Connection - What is it?

I was poking around in the Site Collection Settings and came across the link to Portal site connection. I always wondered what that did so I clicked on the link and was taken to a page where I could connect to a portal site and enter the Web address and name for the portal site. This didn't really help me figure out what it does if I put a site in there, so I did some searching and cam across Gavin's SharePoint Blog. He has a post that talks about the portal site connection and it made a lot of sense to me.



Basically it adds a link to the top level breadcrumb trail that can point back to a top-level site collection. This might not be handy in most instances of SharePoint development but if you create a new site collection for projects or areas of the company, it makes it nice to be able to have a link back to a 'home' portal.