I found a really good description of how to choose the SharePoint 2007 topology that is vizualized in block diagram. The full description is in this post " Inside SharePoint Securing External SharePoint Communications "
When you start new SharePoint project it's very important to understand the size of a farm you are planning to end up, because it impacts on : SharePoint farm topology SQL Server hardware Staff needs Capacity planning SharePoint Farm Topology size...
In these days I'm working with OBA for SharePoint, and was looking through different materials, trying to find the necessary information. In one of the OBA books I stumble over the very interesting diagram, that I decided to post here. I found it...