We split it for each location - SanDiego/Denver/Zurich/HongKong. Further, the individual location canaries can be retrieved from the actual storage array itself - that is, you can just fetch it via sftp/scp/rsync/whatever from (whatever system your account is on).
Finally, our canary is machine readable/parseable and nicely formatted. So much so that the maintainer of "Canary Watch" has told me that he wishes all warrant canaries followed our original format.
Oh By[3] will have a similar canary soon, modeled exactly after the rsync.net warrant canary.
[1] https://www.rsync.net/resources/notices/canary.txt
[2] http://blog.kozubik.com/john_kozubik/2010/08/the-warrant-can...
[3] https://0x.co