Hi,
I wrote a summary about my GPS datalogger setup on the PCA GGR forum, can be found here:
http://comp.pca-ggr.org/phpbb3/viewtopic.php?f=7&t=384
For cameras I am using
* GoPro HD Hero Cam (forward)
* GoPro Hero Cam "classic" (backward)
I modified the camera so that I could attach an external microphone for better sound quality.
To merge both camera views I am using CyberLink PowerDirector. The rest can be found in the link
The Boxster dashboard I created myself after I figured out (in trial and error) the trackvision configuration files
Please feel free to ask more if you need any more info
Cheers
Chris