For those wanting to dig deeper into SharePoint 2010 products performance and Capacity planning, Microsoft has published some very good documents on performance tests, results and recommendations. Again, this is for those Admins who want to dig deeper into SharePoint 2010. It could help if you are creating design documents or archtecture for SharePoint 2010 for your organisation.
Even if you arent looking yet, I suggest you book mark this page. One day you may need it! I know I have and would like to share it with you!
These documents contain scenario based testing of various SharePoint 2010 Service Applications and features. They discuss recommendations by Microsoft on hardware resources, architecture and configuration to maximise and enhance the SharePoint 2010 experience.
Here is the link: