What is Google Benchmark?
http://analytics.blogspot.com/2008/03/benchmarking-now-available-plus.html Industry benchmarking is a commonly requested new service that enables customers to see how their site data compares to sites in any available industry vertical. We believe this data will provide actionable insights by providing context for users to understand how their site is doing. For example, if you have a travel website and you get a spike in traffic on Mondays, you may want to know whether other travel sites get that same spike on Mondays
I think you are adressing google analytical bench mark,if so following is what it is. You can also check this too http://googlesystem.blogspot.com/2008/03/google-analytics-benchmarks.html
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