The Silverlight product team has just release some additional material for advertisers: the Silverlight Advertising Creation Kit. This download includes a whitepaper and samples that describe and demonstrate several aspects of creating ads using Silverlight 2, including:
Creating Polite Ads
This material is targeted toward designers, and provides step-by-step instructions so that no previous knowledge of Visual Studio, Expression Blend, or Silverlight is required. It supplements the previously-released Silverlight Ad Publishing and Serving Guide.
You might also be interested in the following session videos from the recent Mix '09 conference: