It has taken a while, but I finally got around to putting another article up on Code Project. The article is based on a series of blog posts (Finding things with Virtual Earth, Using PushPins with the Virtual Earth ASP.NET control, and Drawing lines on the map with the Virtual Earth ASP.NET control) that I wrote on the subject on ASP.NET Controls for Virtual Earth. However, it is updated and includes extra information on Polygons that wasn't in my original blog post series.
You can find the article here: Data Visualisation with Virtual Earth ASP.NET Controls