It's a tricky little issue: What if you designed a piece of hardware and were also the only one who sold the software for it? Yahoo News reports that you'd basically have to work twice as hard at sales to get the job done. That's the problem Amazon is now grappling with regarding the Kindle. While Amazon is a huge retailer (it just hit #100 on the Fortune 500), it's still a dwarf compared with the big mainstream retail outfits like Walmart, and with no physical stores where people can actually try out the device, its clout is ultimately limited....

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