I started doing some experimenting with Unity3D and I must say I love it so far! 😀
As a first test I wanted to be able ‘drive’ a simple car and have some collision detection.
One problem I ran into was being able to switch cameras. There is no method available at the moment to retrieve all cameras in a scene, what you can do is retrieve all enabled cameras. What most people, including myself, end up doing is creating a script that allows you to set an X number of cameras and you toggle between those.

Click the image to see my first test running.

Controls:
Move: w,a,s,d
Toggle camera: c