research - US-friendly sites:
"Terapeak, an eBay certified provider, is the industry leader in providing marketplace research for eBay sellers and buyers. As of September 15, 2008, eBay has retired its own market research tool and is offering Terapeak in its place."
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"PermissionResearch collects information that is used by a U.S.-based market research company that is a nationally-recognized authority on Internet and general economic trends. Major media outlets such as the New York Times, the Wall Street Journal, and CNBC routinely cite this data. In exchange for having their Internet browsing and purchasing activity observed, members have access to free software downloads and other benefits including:..."
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