I have a few books in my library too, but when I go on vacation, it's tough to pack enough of them. The 354 titles on my e-reader (primitive model; it's pretty near to its total capacity now) are enough to satisfy my needs for such things.

I also have my LJ books on there, with everything I've written in my journal, and all the short stories I wrote for my writing group, and all the chapters of Harry Potter and the Methods of Rationality which have so far been put online.

Not burning my books, but I'm not lugging them around, either.