I've had Kindles since they first came out and tried viewing pdfs on them - I eevn bought a Kindle DX, hoping that would be better, but pdf was still too small a print size. I've converted the pdfs to .mobi and they are more readable, but a lot of the ones I read are ones I downloaded from Safari and they have annoying footers and background images with my account info to help to protect them from being passed around. Safari sent out an email that they are swtiching to ePub format.

I have a Kindle Fire now and the pdf experience is better using a pdf app I purchased (Adobe wasn't very good on the Fire) but it is still a little hard to manage the screen if I need to change the type size. The app is good because I can add notes, underline, and do other things.

For me, it would be good to have a format where I could resize the fonts and have the screen adjust. Maybe an option to enlarge the screenshots of examples. Links to outside references would be good, but not crucial for me. The Silk built in browser now has a feature for viewing content on webpages, where you can have a new screen come up with larger text and no menus, etc. That is really nice.

I use my Kindle for tech books as a way of just reading thru them to get familiar with things or refresh my memory or to be able to read something without being at my computer or tying to manage a 1000 page book in bed. I do miss the ability to flip thru a book to find something, but I think that for me a book in two formats would be good- one a physical book where I can flip thru, navigate chapters, etc. The other a digital format where I can read the book conveniently and where I can search for terms- that is one advantage that a digital format has over the physical format. If I could only choose one format, I would choose digital for most. I could read on my Kindle and read in the Kindle reader on my desktop computer and have it on one monitor to show the book and use the other monitor for working thru examples. I like the ability to search, underline, highlight passages in the digital format.