If you want to process the data from those cameras, i would look at the ROS tools, and maybe the PCL library.
ROS has apparently a module capable to get the data from the camera directly (
http://wiki.ros.org/swissranger_camera), or at worst you may use the swissranger sdk, it seems well documented and has some examples (but then C is your only option).
These libraries have a lot of algorithms available (SLAM, surface reconstruction, object detection/recognition, ...) that should help you to make something useful out of it.
There are plenty of applications for those cameras, mostly in robotics, human-machine interface, industrial context, and autonomous vehicles, but most are probably too complex for a hobbyist project.
A simple project could be for example to make a simple motion detector, basically an fancy version of a PIR motion detector, with the advantage that you can potentially discriminate between different kind of object/person/animal.
According to the datasheet, those models have indeed good range, accuracy, and speed, but are lacking resolution side (qvga seems to be the standard these days, that's already more usable).
Also, i am not sure how well it will work outdoor with direct sunlight, since it can be affected by DC infrared illumination.
In case you want to sell one, i would'nt mind playing with a SR4500 in working condition, how much would you ask?
Also, if you don't mind the shipping cost, maybe you could send one of your useless prototypes to Dave for a five minutes teardown.
I don't think there will be much interesting stuff inside, since it is probably highly integrated, but those are still pretty rare and interesting devices, and i don't remember seing one in any mailbag video.