Here's a couple of new Virtual Earth articles. First is this good one from Jonathan Hawkins on how he built a mashup of US national parks using Virtual Earth and Altas, the Microsoft's Ajax framework. Detailed step-by-step instructions with lots of code and screenshots.
I will be updating the /howto guide by next week with these and a variety of other good articles that have come-in over the past month. Actually, next week I'll be updating the whole site.