Have you analyzed where your sales are from? I made an analysis of sales from June 2008 to June 2009 and found 65% of sales are from US, 15% are from UK, Greece, ZA, Australia, Canada, Austria and Brazil. The sales of these eight countries account for about 80% of total sales. Maybe it is a stupid question, but I think the analysis will help us make the next marketing.
Across 2 years my sales were 70%~ from the US with UK coming second, Australia third and Canada, NZ, South Africa, India etc more or less evenly distributed.
I am in a testing phase of launching my first product with CB and my experience as a marketer is limited to publishing 35 articles at Ezine. But so far out of 11 sales I have made... 10 are from US and 1 is from Zaire. I hope it helps.