I am unable to locate any hard numbers for the adoption rates of Silverlight (there doesn't appear to be any officially published figures), but something tells

I am unable to locate any hard numbers for the adoption rates of Silverlight (there doesn't appear to be any officially published figures), but something tells me it's a lot less then the 41.7 million 360's sold. I think that you're right that both are "successful." But I believe I'm not alone in thinking that the 360 was a far greater success. edit: Further research shows 56% of browsers for September sport Silver light (http://www.statowl.com/custom_ria_market_penetration.php http://www.statowl.com/custom_ria_market_penetration.php), but this is hard to compare apples to apples. Personally, to me a ~$300 purchase is worth a lot more then a free plug-in download anyway in terms of how successful something is.