Very easy and cheap suction cup windshield mount for your GoPro camera.
Step 1: Buy Suction Cups
Bought two of these at amazon for $1 each.
They are rated to carry 3 lbs. each.
Step 2: Mount Support Strip 
I used a piece of aluminum angle I had lying around and cut it to about 4″-5″ long.
You could also use a piece of 1″x1″ wood or other material.
Drill holes for the suction cup screws at each end of the support strip.
Also drill a 1/4″ hole for the camera mount screw in the center of the strip, but perpendicular to the suction cup screw holes.
In my case, the screws that came with the suction cup were fairly short so they worked with the thin aluminum.
If you use wood or thicker material, use longer screws.
Just make sure the screws don’t penetrate the back inside surface of the suction cup.
I had to use washers to make up the required thickness to ensure the screws did go through the suction cup.
Step 3: Camera Mount
I used a GoPro Tripod camera mount, because it is cheap and can be used with multiple different mounting strategies
This takes a standard 1/4″ -20 thread screw.
Again, use washers if your screw is too long for the condition.
Step 4: Mount to Windshield
Mount to inside surface of windshield.
I use it facing forward in upside down mode.
I have used this gopro suction cup camera mount for timelapse as well as video.
For an example of the timelapse taken over a 2-hour car ride, see http://www.youtube.com/watch?v=2q_SMHyndcY&feature=plcp
