Explaining the archive.org blocking
There is a complete explanation from Demon/Thus as to what happened at
http://groups.google.com/group/demon.service/msg/6d14597274f42ecd
In summary:
* Entries on archive.org were on the IWF list
* There was a bug in the Wayback Machine software, which Demon's blocking tickled
* Demon didn't perform any content manipulation
* Demon didn't unilaterally filter or block web.archive.org
* The Internet Archive have now fixed the bug