Web Citation
Archived Pages
Archive.today
Follow That Page - web monitor: we send you an email when your favorite page has changed.
Cached Pages
CachedPages.com - Get the cached page of any URL from several sources
Google Cached Pages of Any Website
CachedView - Google Cached Pages for any web site. It is the ultimate Google Cache browser.
Archive.org (downloader)
Download an entire website from the Wayback Machine.
CachedView
CachedView searches multiple providers to see if a webpage is in their cache, and will link you to the result.