Do you know who your best customers are?

Further evidence (if you needed it) that customer segmentation is vital to your business:

According to Nielsen/Netratings, just 18% of online buyers account for a full 46% of all online spending. The bottom 55% of online buyers accounted for just 21% of online purchases.

Surprisingly few companies leverage the right segmentation of their customer and prospect databases to successfully separate the occasional customer from the power shopper.

Do you know who your best customers are? What are you doing to treat them differently? To keep them loyal? To leverage them, if possible, to create more best customers?