Here's an interesting piece on keeping your used textbooks. In some cases I think this is a good idea, for example, keeping the texts in your major or perhaps texts for courses you really enjoyed and want to refer to at a later time. In some cases, however, it probably would just add to clutter.
http://www.onlinedegreeprograms.com/blog/2012/7-good-reasons-to-keep-your-old-textbooks/
http://www.onlinedegreeprograms.com/blog/2012/7-good-reasons-to-keep-your-old-textbooks/
