Where's all the Interactive money being spent?

Interactive ad revenues toped $21 Billion last year (source: Interactive Advertising Bureau, May, 2008). So on what Interactive products are advertisers investing? Here's a quick look:

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Steve Burgess's Gravatar So - I don't see streaming audio in this chart. Is it part of "rich media?"
# Posted By Steve Burgess | 6/12/08 9:09 AM
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