A few weeks ago I thought I bookmarked an article, but I couldn't find it back in my bookmarks. Eventually I found the article back through google. Bookmarked it again, and still couldn't find it though the bookmarks. So I take a closer look, turns out the article was a tip and not an article. I had totally missed that (though I don't care if it's an article or tip). After looking even closer trying to find the bookmark I found the link to the tip and tricks bookmarks, that was not very obvious I have to say. Maybe for power users the difference in type of bookmark can be useful, but for the average joe like me it's quite confusing and wasteful of my time trying to find something back I thought I had bookmarked.
Just for reference, this was the tip (when you land there from Google, it's not quite apparent that this is a tip either):