Google's search terms analytics can be your crystal ball, and give you those answers. Just use their trend-spotting algorithms via Google Insights for Search.
It might seem a tad confusing until you read Wayne Jordan's column explaining how to use the Categories, Seasonality, and Geographical Distribution searches to find out the ''what, when, and where'' scoop.
Read the Antique Trader article here:
Ms. Dow Antiques Blog 'Tique Talk is published by msdowantiques.com