Simsi - 2:41 pm on Jul 8, 2010 (gmt 0)
Other than the slightly barrier of buying a domain rather than setting up a subdomain, surely there's a clear framework already.
That's a big barrier - indeed prohibitive -for many businesses, especially newer ones. Most domains names are taken or squatted. A business has full control over a subdomain.
The WMT option would work well - if it definitely works but there seem to be conflicting opinions on that, even in this thread. But even then it's unique to Google afaik where a standard could apply across the board.