Nielsen Online vs. ComScore search engine rankings?

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Yesterday, Nielsen Online released its September 2008 data for the Top US Search Providers.

Google came out on top with 59.7% and Yahoo came in with 18.1%. MSN garnered 11.8%.

This normally wouldn't have come as a surprise except for the fact that I recently learned that ComScore's September results differed as much as 3 percentage points. In its results, Google had 62.9% of the market share, Yahoo had 20.2% and MSN had only 8.5%.

I'm currently looking into the differences between Nielsen's and ComScore's methodology. More to come...
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