I have done CD portfolios with the final document being an Adobe Acrobat file. One of the good things about acrobat is the ability to combine, word, image and sound (if you want) to create a better experience for the viewer. Acrobat reader is required to read the file, but Acrobat reader is free and usually comes installed on computers.
There is an abbreviated version of one of my Adobe projects on the LensWork web site. From www.LensWork.com, click on the goodies link.
It's the Fifty project.
I will have some more of these on my soon to exist web site.