Silverlight does not have built-in binary serialization; however, protobuf-net runs on Silverlight and can help bridge that gap. In the current assembly, you can only actually serialize the types that you control (due to adding attributes) - however, in the middle of a lot of refactoring (among other things), I add support for serializing types without attributes.
I expect it to be another 2 weeks before it is available as a stable build (hopefully) stable, but you can take a look at it then.
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