http://www.higherverticalnow.com/ , you must give your email to access the main page.
There is a good long video from A-Link there , analyzing jumping form.
Its mostly technique for SLRVJ , the 2 real examples are also 1-foot jumpers , but he insists many points are the same for 2-foot jumpers too.
It also looks like its gonna be a 4-vids series there , released gradually.
Sure worth a look , let me know what you guys think...