Here I go, I've modified a bit the actual version of psp-pdf, added to it simple functions (like select page, zoom and exit. also, it loads a pdf in the same page/position when you closed de application). I'm researching to find why the colors are so changed (I think it's because it formats all to a 8 bit color mode, but I'm not really sure).
I post this because I'm looking for someone to help me out in the color part (need to change to a normal 24 bit mode), and how can I post my release at pspupdates.com.
Instead of starting from somewhat scratch, why don't you joint the "bookr 0.6" development group. They have done a great job on building a pdf reader. I use it on a daily basis, and its great.