The ability to identify people from places other than Cambridge is a much-requested feature for Raven which Shibboleth supplies 'out of the box'. There is already some interest in Shibboleth from areas such as the e-Science community who already have to manage users from multiple institutions.
The fact that Shibboleth is a standard makes it likely that third-party software will support it directly – current versions of Media-wiki, Moodle, dSpace, MyProxy, and uPortal all claim some level of Shibboleth support.
Delivering attribute information along with authentication is another feature commonly requested of Raven that Shibboleth addresses, so it's likely that Shibboleth will eventually be used to support intra-University applications.