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Wlauzon - 8:15 pm on Feb 23, 2009 (gmt 0)
If the ecommerce pack you are using does not have that, then it might be more of a pain. We get probably 5% or so of our sales from them.
Most halfway decent carts already have some sort of Google Base thing setup in them to generate the feed. If you have one of those then it is not all that difficult.