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If you're looking to get you started on developing RIAs with the Silverlight 2 stack, you should check out Bob Familiar's series of articles on topic.
Bob makes use of SL 2 XAML, WCF, controls, templates, data binding, and (yes) deep zoom in his sample, all in a lucid, approchable way.
Bob also walks you through some of his musical experiments (which are way better than my musical experiements, which usually explode on contact with the Internet.)
Please let us know how you like Bob's Sliverlight musical stylings...