pageoneresults - 2:40 am on Feb 3, 2011 (gmt 0)
If there's already a 301 for that URL, then Google would never see the noarchive.
Understood. It's just a hunch tedster. Since implementing noarchive years ago across all sites that I manage, many of the issues discussed in the fora don't affect us. From scraping to all sorts of other things that people discuss about cache.
Something is wrong somewhere in the process for Google to hold onto old URIs when there is a 301 in place. Apparently it is not seeing the 301? Or is not seeing properly? I dunno. I just "think" that noarchive sends a different set of signals to Googlebot and causes things to happen faster and more efficiently. I may be totally off my SEO rocker too. ;)