Ccm304 who its been announced is the original author of the PDF to PSP proggy has released Bookr which is a PDF player for the PSP, heres whats new in the latest release:
This version includes bookmark support contributed by da5id. Also many crashes related to DRM PDFs have been fixed, and error reporting has been added for invalid or unreadable PDF files.
Thanks to everybody for the feedback!
Note: if you report a crasher bug please try to upload the file and provide an URL, or find the same file online and provide an URL. This will help a lot in fixing the bug.