With a PDA, you could keep electronic copies of the materials. I don't know if Blackberries support Office files, though.
I've seen journals that either had a file pocket built-in or were incorporated into folios. You might look around and see if there's a journal-folio combination that you like.
In your place, what I would probably do is use a small looseleaf binder. Tuck the pages into sheet protectors so they don't get dog-eared. The same binder might also work for short-term reference material like meeting agendas, maps to customer sites, etc.
Hope this helps!