As far as college text books are concerned, it's a weird situation and I don't blame anyone who says they simply prefer a paper text book. Here's why. Have you ever tried to use the officially-sanctioned eBook solutions that are available on the market today? They're pathetic. Completely locked down with DRM and mired by bad interface design and usability. I bought an eBook for one of my classes at the beginning of the semester. I had thought to myself, "Hey, this could be great if it's like I imagine -- like downloading an eBook to my Kindle app on my iPad." Boy, was I mistaken. I had to download a half-backed piece of proprietary crap-ware in order to "read" my book. The user interface in this "app" (rhymes with "crap"?) was appalling. The interface was clunky and looked like it was thrown together in a single week. The pages were pixelated, not crisp like a PDF.
In the end, I resorted to _illegally_ downloading the books (as PDFs) I had just purchased legitimately on account of the inadequacies in the kosher versions. Ironically, now that I've gone through one semester being able to carry around my iPad (< two pounds) instead of paper text books (~ twenty pounds?), I would never -- not in a million years -- go back to paper text books. It's unfortunate that all these media corporations have been allowed to drag their feet so slowly in embracing new technologies and formats for delivering their content.
At my company, we use Gitolite and I've only had good experiences with it.