Online entrepreneurs are flocking to specialized e-commerce sites that connect niche groups of buyers and sellers. From arts-and-crafts site Etsy.com to data-sales specialist Infochimps, experts say the niche sites offer a tailored service and a sense of community that one-size-fits-all online marketplaces like eBay can't match -- and the sheer size of the online population means there's more than enough customers to keep specialist sites afloat.

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