Wal-Mart in particular is looking to propel its Web site, which has not been a star performer, into the top five most trafficked sites.

RateMyTeachers.com, a heavily trafficked site that has been online since August 2001, allows high school students to post anonymous notes about teachers while also rating them.

Another heavily trafficked site, carders.

In less than two years Hotfile has become one of the 100 most trafficked sites in the world.

(The Observer is "not a highly trafficked site," Mr. Lerer said delicately.)

Our only complaint: this heavily trafficked site, which had 463,000 visitors in August, according to the Media Metrix research company, may be too popular.

At a point in time, it was among the most trafficked sites in Norway, but as of 2009, the sites had been closed down in both markets.

(To put the Modern's yearly numbers in perspective, Yahoo, the most trafficked single site on the Web, has more than one million visitors a day.)

A business colleague offered to handle advertising sales on this highly trafficked site.

They won't want a bad review on a heavily trafficked site and so will usually make amends to an aggrieved customer.