Display Document Library Folder contents on a different Sharepoint 2007 Site

What I want to do seems incredibly simple, but I am getting nowhere quickly searching and reading about this.

I need to list some policy documents on a Sharepoint page on our corporate intranet. This is in web application http://intranet The documents are stored in a folder in a document library in our HR Team Site - that's in http://teams/sites/HR.

There seem to be a variety of methods for displaying the content of the folder on pages within the same site collection or site (e.g. Content Query Web Part, List View Web Part, Data View Web Part), but automatically displaying this in a different site collection seems very difficult, without spending a lot of money on a third party web app, or spending many hours writing one myself.

Am I missing something here? I thought Sharepoint was about leveraging your content and data across the enterprise.