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Thank you for your interest in Aspose.Words.
1. Aspose.Words supports converting to XPS format, which can be used in Silverlight. Also, we plan to support XAML format, which can also be used in Silverlight.
2. Here you can find a good example, which shows how you can use XPS to show document preview in Silverlight:
3. You can extract specific pages upon saving document to PDF, XPS or image. But there is no way to extract specific pages and save as Word document, because MS Word document is flow document and does not contain any information about its layout into lines and pages. So there is no way to determine where page starts or ends.
Please let me know in case of any issues, I will be glad to help you.