This is great. I'm really happy for your kind comments.
I have decided to quit several PDFs ago, but I always fall back on making these as they are comfort work (at least for the first 40-50% of the PDF). I have had Wonderswan and NeoPocket in mind several times when deciding on what platform I want to cover. Would have liked to tackle the strange "video" game VHS and laserdisc systems too. But I have a problem with time management when creating them, which makes it difficult for my family :p The last months on the projects are also pretty tiring as I start to loose interest. I also have a problem with taking breaks in the middle of a project, as I find it difficult to continue where I left off (similar to when I play video games).
It's really cool that you print the PDFs. Do you bind them into a book form too. I shudder to think on the print cost though :p (4500 pages on the PS2 PDF). You don't have to think about donations. Your words are much more valuable to me :)