http://angstrom.s3.amazonaws.com/demo/beaglebone/index.html is
broken.
For example, http://angstrom.s3.amazonaws.com/demo/beaglebone/u-boot-beaglebone-2011.09+git-r25.img
yields:
<Error>
<Code>NoSuchKey</Code>
<Message>The specified key does not exist.</Message>
<Key>
demo/beaglebone/u-boot-beaglebone-2011.09 git-r25.img
</Key>
<RequestId>DE47ABFB85CD3403</RequestId>
<HostId>
aAn7KFTU4UqlhvDlP5P4o4Ud3joh9kQADMjR8EQTE6gp7PI8x5DKcPsB5RLYURwq
</HostId>
</Error>