My bookmarks are roughly broken into two groups - a small set that I go to specifically on a regular basis, and a much larger set that's organized loosely into a long list of folders. I rarely go into my bookmark folders to click on one of these links specifically.

The value of that larger set of bookmarks is like a personalized search history. When I search for a topic, I really like knowing whether I've already visited a relevant site. It saves sifting through raw search results for topics that come up a few times a year, or when I work on specific kinds of projects.