PocketMatrix

I never had a handheld so I know little about it, I have some questions : can I use digital camera memory card for handheld? what's flash rom? how much memory I need to read some ebooks(for travelling)? If I have a PDF road map,can I convert it to handheld file and how can I see it in a small screen?

thanks in advance

You can download a pdf reader for free from here.