Alan,
I wish that I knew DVD Architect, to answer your question. My *guess* would be that you could finish your Project in PE and then Export it, for Import into DVD Architect (like I do with Encore), but I am not sure. Others can tell you exactly how it would work. Also, a lot of folk over on the www.muvipix.com Community use it, so you might get some insight there too.
So long as your user is on a computer, with Adobe Acrobat Reader installed (might even furnish a link to that free program), the navigation by page could be done easily. You might need to construct your PDF document with that navigation in mind. I doubt that you would need the full Acrobat Pro, as most current word processors can output to .PDF. Just plan your pages in WordPerfect, Word, or whatever, to allow the navigation that you want.
Sonic WAS working on a program, eDVD, that would have allowed a set-top user to view and navigate .PDF's and similar. Unfortunately, they could not port it for Vista, and the last that I heard, the project had died. There might still be some copies of Sonic eDVD (think that was the official title) floating about the Web, but remember that it only made it to XP, and not Vista. Maybe Sonic, or someone else, will ressurrect it and make it work under Vista and Win7.
Good luck,
Hunt
