(2) The measurement of the amount of users that visit a Web site.

Guaranteeing an Increase in Your Site Traffic
The most simple and affordable of traffic building strategies are surprisingly obvious to only a minority of webmasters around the world.

Software for Analyzing Your Web Site Traffic
Undoubtedly it's good to know how many people visit your site, and site analysis programs can tell you all this and much, much more.

Unconventional Wisdom: Traffic Is Overrated
According to Alexis Gutzman, one of the many factors considered a heavyweight in the profitability equation, web site traffic, is highly overrated.

ClickZ Stats
Home page for ClickZ Stats, a reference desk site for Web marketers that provides statistics and Web marketing information.