hit 0 only give you the default camera view.
I’ve 2 cameras, I would like to see the second camera view, how do I do
this?
huh? sorry, i couldnt understand you…
Select your camera and go to edit buttons,…you will get a pulldown menu with your cameras.<edit> never mind that doesn’t seem to toggle the camera,…I will check it out for you though brb…
<edit> I couldn’t find anything on toggling cameras, but I know there is a script for it in Python and Plugins. You might try that.
<edit> or just do what weirdhat says.
Select the camera you want, press Ctrl+0.
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WH has the correct answer, but I wish to add that CTRL-0 works with all objects, not only cameras 
Stefano
so i can make a cube my default camera?
what do you mean S68?
I am assuming it toggles the active object, but I forget why you would want to do that.
It’s particular usefull for spot lamps.
Right,
and for Armatures, in very particular cases:
Parent Empty to Bone
Switch to Empty view
Operate on Chain.
That chain stay always planer
But, well, now we have XYZ rotation constraint
Stefano
Rotation constraint where already there in 2.25, although it’s fun being credited for work I didn’t do 
Martin
Shapeshift, doing that for a cube would be only for aligment reasons… (point to something). Not very useful for an object, but really useful to Control 0 on a light, to make the aiming… Then Control 0 again for selected camera.
Rangel
Got it.
Thank you guys!!