Muddiest Point: Digital Preservation

There has been a lot of talk about what would happen to a library's licensed digital resources if the vendor went under -- since nothing is physically on the shelves, access to all those materials could be lost as though it never was. But I have heard that some vendors offer guaranteed continued access through third-party permanent repositories, and that some institutions are partnering with each other to build and maintain the same. Can you point to any examples of these types of ventures?