You will receive the manufacturer's printed user manual with your camera.  However, at these links you may review manuals prior to purchase, or download and make yourself a copy to replace your manual if needed.

GoPro User Manuals

 HD HERO Cameras (Full 1080P HD)

 HERO Cameras (5 megapixel, Standard Definition)

V.I.O. User Manuals 

 POV 1.5

 POV Power

ContourHD User Manuals 

 ContourHD 

Liquid Image User Manuals 

 Scuba Mask HD 320 

Drift Innovation User Manuals 

Drift X170 

Drift HD170 - coming soon