I have access to Unity 3 B4 but it doesn't appear to include any sample projects. Where can people download sample projects from?
It would be great to be able to experiment with the projects seen in demo videos e.g. the soldier training scene, the cloth demo and the demo illustrating the rapid adding of scene infrastructure from within the Unity editor.
I don't believe those demo projects are currently available. The only assets and things you have access to are the ones that are included with Unity 3. When you start a new project, and are prompted to include various Unity packages into your assets, I believe (as of right now), that's all you get. Most of the items from the videos were probably in-house demonstrations that are not going to be released to the public.