As people may have seen, Google Code (where the Linked Data API
specification is hosted) will be shutting down.
I have exported the repository including the wiki pages to:
https://github.com/UKGovLD/linked-data-api
This seems like a reasonably appropriate and neutral location for it.
The export process was not entirely smooth and took several attempts. If
you spot problems please put an issue on the GitHub repo or email here.
Dave