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If you want to stay on top of what’s available from Amazon here’s a great way to do it, courtesy of one of the best technology ‘news you can use’ sources out there: Lockergnome. Chris Pirillo, who runs Lockergnome, has set up Rich Site Summary (RSS) feeds — if you’re not sure what those are, check out my recent column on the topic — of new products on Amazon.com, from baby gear to videogames, all organized into topics.