The RevCanonical service is a quick (30 minute hack) to search referenced resources for:
- <link rev=”canonical” href=”…”> (i.e. “I am the canonical URL of that page over there”)
- <link rel=”alternate shorter” href=”…”> (or truth be told any link rel including the string “alternate short*”)
And will return a short (or at least reverse canonicalized) URL if found, otherwise it will return the original URL.