google released 100 tops sites with interesting data page views,reach,unique visitors check here : http://www.google.com/adplanner/static/top1000/#
I am wondering which services make Yahoo be at the second position? Would anyone share some information on this issue? Thanks,
this list is based on Unique Visitors. yahoo is on second position because based on Yahoo mail services and Yahoo answering services.
I'm sure Google is far beyond on top of it. Search for Statcounter's statistic of internet search share of major SE and Google is far on top over Yahoo and Bing.
This is a great tool, especially for search marketers to compare competitor sites -- the information from this can help put together a successful marketing plan for your web properties or client properties.