If you aren’t familiar with Diigo, it is a social bookmarking website where students can collaborate on the web. Diigo works in to a project based learning environment nicely and allows for exploratory learning and collaboration.
In the past two+ years, I've read and bookmarked almost 3,500 websites that I wanted to keep. I've also highlighted the interesting passages on them, and written margin-notes about those highlights - all without printing the pages.
I've also put all 3,500 websites in a file cabinet - without printing them out - that I can access anywhere in the world that has an internet connection.