http://forums.eagle.ru/showthread.php?t=129341
Just spotted this on the ED forums. After giving it a go I can say it's certainly rather useful indeed. Just drag and drop pdf files and it will convert each page to .png for the knee board and store in folders etc. Then you use the app istelf to configure which pages to want on your knee board. With the group function it'd be easy enough to setup some kneeboard presets for each DS mission (or training missions etc.).