Google has a beta site called Google Insights for Search which looks like a fascinating and valuable starting point for finding secondary research about broad consumer and business trends.
In fact, the search categories are tailor-made for businesses seeking data to support marketing and management decisions. For example, one bullet, Seasonality, says: "Anticipate demand for your business so you can budget and plan accordingly."
You can filter your search by Web, news, image or product; by nation (and smaller geographic areas); by date or date range; and by category (such as automotive, business, games).
Google has a quick overview of how to use this beta tool here. Worth a try--and you can't beat the price.