On a whim...

I decided to post some of my old textbooks on amazon.com. So far, I've sold four of them. It's been nice to clear out the bookshelves of books that I will never look at again. I've kept a few textbooks for now, but I can't decide if I will actually need them or not. Most of the information I need, I can find online. So it's a struggle: do I just get rid of all my books, or do I save some books "just in case" I need them?