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Hmm... I'm not sure I like that as much as getting the product page indexed and known by the engines as the canonical version. Perhaps you could produce the RSS feed/blog with the reviews, but use rel="canonical" on those pages to point over to the product pages which include the reviews? That would be a way to potentially have your cake and eat it too

Hi Antonio - a lot of sites, particularly in the e-commerce field, face precisely this issue. What I've seen be most effective is what Amazon, BestBuy and many others do, which is to create a single page for any product and include editorial/user reviews and more detailed information when it's available and when it's not, leave that area open for future additions of content. This way, you have a single version of any given page and you create a positive association with the crawlers and humans that some/much/most of your content/products will eventually get a good, rich description.

You can also use Saibose's suggestion in combination if you'd prefer having this content in separate, embedded "tabs" on the page that all resolve to the same URL. Check out a code sample and example of this in action here - http://dhtmlkitchen.com/scripts/tabs/tutorial/navigation.jsp

Best of luck!
Rand