Week by week all the webanalytic vendors announce record results. Press releases don’t say much so I took the top 5 vendors and let them compete against each other. Here the results:

I. Alexa

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II. Metricsmarket:

Omniture: Estimated 875,100 visitor sessions in the last 30 days

Websidestory: Estimated 539,800 visitor sessions in the last 30 days.

Coremetrics: Estimated 193,600 visitor sessions in the last 30 days.

Clicktracks: Estimated 722,000 visitor sessions in the last 30 days.

Webtrends: Estimated 678,200 visitor sessions in the last 30 days.

The numbers just give an idea and are not accurate, b/c these vendors work with different techniques.