While I know this thread has died down a bit, AND I know the OP was asking about paper books, I thought I would put in my two cents about ebooks, just because it might help someone.
I am a techie, bibliophile, and information junky from way back. Like many other paper-book aficionados, I like to be able to highlight, bookmark, and write in the margins of my books. At one time I had about 3,000 books. With so many books, I had no way of remembering where I had read a particular thing, or where I had written a comment. When I decided I was going to sell my house and go back to school, I had to pare way back. I ended up giving away what seemed like a ton of books. Yes, that sucked. Over the years, I ended up building up another quite large collection. But life has its ups and downs and after a few downs, I realized that I was going to have to pare my life down to what could be moved in a single economy car. But I did have the luxury of time. I had about a year before I was going to have to move. So here is what I did:
I scanned all of my books, papers, and photographs. ALL of them.
I purchased a scanner that is made especially for scanning books. It is called an OpticBook by a company called plustek. Mine was the 3600 but they don't make it any more. The closest match is the
3800. The scanner is designed to allow the scan-head to come almost all the way up to the outer edge of the platen. You lay the inside margin of the book over the edge and mash it in so that you only miss about 1/4" of the inside margin. The rest of the page lays flat, so you get perfect scans. At $250, the thing costs a bit more than a regular scanner, but it was well worth it to me.
I can scan a 200 page book in about an hour. Add another half-hour to an hour of computer time to convert it to PDF and perform optical character recognition (OCR). The scanner comes with software to convert your scans to searchable PDFs, which means you can select text and copy it. Windows Search will also index the files (with an additional plug-in) so you can use your library of PDF files like a huge, personalized Wikipedia on your own computer. Now, I don't use any of the OCR software that came with the scanner. I just scan to .BMP files then use my copy of Adobe Acrobat Pro to do the conversion and OCR. I get a more than adequate result, I have more control over the process, and the process is a bit less tedious for me, but that software ain't cheap. Though there are several other PDF editing programs available for a more reasonable price.
Now, as to file formats and readers: I use .PDF for everything I can. I did a lot of research and found that proprietary e-readers may allow you to add highlights or annotations, but NONE of them allow you to actually get those out for use anywhere but inside that book. With PDF, you can add highlights, comments, all kinds of things. Then you can search for them, and copy and paste them anywhere else you like. On the one hand, it is not as convenient as simply grabbing a book and thumbing to the right page, but on the other hand, you can search through thousands of books instantly.
If I download an e-book that is not in PDF format, I use a free program, called
Calibre to convert it to PDF. Of course, this only works for non-DRM (Digital Rights Management) books, but I only have three of those and they are only fiction.
It is also easy to read PDF files on an e-reader or regular Android or iOS tablet. Now, most proprietary e-readers will not allow you to add annotations to the PDF files; or, if they do, the annotations are trapped in the e-reader. So my preference is to use a PDF reading program on my Android tablet. My favorite PDF reader is called RepliGo Reader. It only costs about $5. Repligo Reader allows me to add comments and highlights to my e-books. Then I can transfer/synchronize my books back to my PC and be able to access those comments directly. (The synchronization process can be a little tricky and depends on which type of device you have.)
Finally, if you have thousands of e-books, as I have, then you might want to start organizing them a little bit. I'm pretty OCD about the whole thing so I worked out a whole system for that and wrote an
entire blog post about it. It is a bit of a long read, but if you really want a way to organize your e-books, I have already done all the hard work for you.
I know this is a bit of a long post. I hope it will be helpful to others who are dealing with the issues of fitting a lifetime of books into a new life on the road.