If it's something personal, I use http://archive.is with their bookmarklet in Chrome (free; unlimited archiving). It immediately renders the page, saves a copy with a unique url, and gives me a .zip link to download the archive.

If it's something I want to submit to the Internet Archive, I use wget with WARC extensions (http://www.archiveteam.org/index.php?title=Wget_with_WARC_ou...), submit the archive to the IA and notify them it needs to be merged in, and keep the .tar.gz archive.

Eventually I'll webapp/one-click the whole thing, with an archive to S3 and/or Glacier.

Disclaimer: archiveteam participant

+1

Good point. Perhaps a "download catacombs" feature?

This feature would make it much more useful.

What if the server was not in the US? A DMCA takedown notice would not apply.

That's actually worse, since if there's no DMCA-like safe harbour, they can be sued immediately.