New streaming devices from Roku, Amazon best Chromecast

Roku and Amazon this week debuted new or updated, budget-friendly streaming devices that challenge, and in some ways outperform, Google's popular Chromecast dongle.
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San Francisco journalist Bill Snyder writes frequently about business and technology. His work appears regularly in CIO.com and the publications of Stanford's Graduate School of Business and the Haas School of Business at the University of California at Berkeley. He welcomes your comments and suggestions.