Marketing_Guy - 10:10 am on Feb 29, 2012 (gmt 0)
What about 301 redirects or some aspect thereof (i.e. just non homepage redirects, just external redirects)? Been gamed for years with people buying up old / expired sites for the link equity.
They could effectively maintain some of the functionality of redirects via rel=cannonical and site address change via WMT, without needing to use them as PR conduits.