I hate keeping bookmarks. Often, I'll find myself having visited a site a lot through links from other sites, but never remember its URL because each individual time I visited, the site wasn't important enough to remember. I want the web browser to keep track of what sites I visit frequently, and put them in a list for me. And I want the feature to be smart enough to work without me having to perform any configuration, or maintain any lists manually.

The bookmark paradigm hasn't really changed substantially since Mosaic was the Cool New Thing. Considering how central the concept of "remembering where we've been" is to the whole web experience, you'd think the bookmark/history tools would have evolved a little more than they have.