Web search leader Google's market share inched up to 64 percent of all queries among U.S. Internet searchers in March, gaining further ground against Yahoo and Microsoft, a survey released on Wednesday by Hitwise found.

http://news.zdnet.com/2100-9595_22-6175248.html

The zdnet article claims Hitwise is reporting the surfing habits of 10 million people but a USA Today article only claims they use a sample base of 100,000 people. Which is it?

http://news.yahoo.com/s/usatoday/20070412/tc_usatoday/googlesearchchipsawayatrivalsmarketshare;_ylt=AqHtaeH8PgsdIAseoAnixdzMWM0F