I like to save the URLs of sites or pages I might need in the future. Because I have had to change computers from work to home and because I’ve had computers crash and die, I like to keep my bookmarks in the cloud, that is, I like to use web applications to save my bookmarks, rather than save them in my browser. To do that, I mostly use Diigo, which I also backup to delicious, (just in case either fails).
What I like about Diigo, is that I can add a description of the site, and, in some browsers, Chrome for sure, I can highlight sections of the webpage text and have it show in my Diigo library.
Here’s a screencast explaining how that works: