Those are really neat!! I will have to get one of those to add to my collection of things that I can't program!
You could make a daughter board for it with dacs and buffers and all of the stuff you need for it, then write a bunch of software or you could just buy one of these.
http://ether-dream.com/
Not as cheap but he isn't making 25000 of them, the price will come down with volume. These are already built to do laser specifically. They have a 100mhz 32bit ARM, dacs, safety interlock,SD, Ethernet.
More importantally, firmware that is working and an interface through ethernet to a robust and getting better, pc laser software, LSX. The hardware is the easy part. The tool chainn is free, the code is open source.
I am all for reinventing the wheel, but that processor and the linux overhead are way overkill for streaming points to galvos, in my opinion.
anyway, neat little board!
chad