Today's digital age makes it possible for people to collect many things for free. With the low cost of hard disk drives, storage is practically unlimited. With digital storage, there's no dust, no mould, no silverfish and no deterioration.
I have a collection of my own photos and a collection of music in MP3 format. I am now building a collection of e-books on photography. I certainly will not attempt to read all the photography books (there's about 150 now, and counting), but I just wanted to have a reference library on photography. In the past, building such a library would be prohibitive in cost and storage space. With digital technology, this is just a cinch. I am also enthralled with downloading e-books of other genre. It is like looking for treasure on the internet.
Here's a great website for all kinds of books: http://www.freebookspot.in/
Here's one for Christian literature: http://www.plough.com/ebooks/index.html
Notice that most of the free books are in pdf format, which doesn't go well on an e-reader, but opens up alright on a normal computer screen. I usually look for mobi or epub formats to use on my Kindle e-reader.