Compete has just launched a new Attention metric, defined as "The total time spent on a site as a percentage of the total time spent online by all U.S. internet users". They now have daily updates, measuring the "velocity" of change in attention as well. It's an interesting view of overall traffic, and the tools provided by Compete are pretty cool.
The WAA has a research committee focused on measuring "new media", providing useful methodology and best practices that is also worth checking out if you're interested in more specifics on this topic.
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