From a personal point of view, I like Silverlight. I think it looks clean, sharp, I like the functionality and versatility that it offers.
But in terms of usability, looking at the answer from @Mace, I agree that if it werenβt available on growing platforms that would definitely have to take something into account.
A site shared by both @theChrisKent and @Brad Christie is great for getting the necessary information about platform information.
But, again, if it were me, I would go for it only for cleanliness and functionality Silverlight brings to the table. Yes, it can reduce your web traffic, but how much it will simply depend on how your customers look and how their platform is.
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