[NTG-context] Examples for letters, articles, books?

Please forgive me if this is a FAQ, but since I just subscribed and the archives aren't searchable, I thought I'd ask. I've been a casual LaTeX user for a couple of years, and now I'd like to give ConTeXt a try. The one thing I'm missing in the docs is a set of examples for common documents, such as letters, articles, books and so on. Could anyone please point me in the right direction? Thanks, -Ralph.