To create your own PSP magazine, all you need is a photo editer like Adobe Photoshop, Paint Shop Pro or Macromedia Fireworks. Just create a image sized 480p(W) by 272p(H). Do this several times to make multiple pages. It is a little time consuming but once you get used to the program, you will find that it becomes a lot easier.
We use Macromedia Fireworks to create our magazines. The frames feature allows us to create multiple pages using just one file. The export feature allows each frame to be exported into seperate images to create a multi-page magazine.