How do you manage your browser bookmarks?

I'm stuck.
I have accumulated a decent set of browser bookmarks, both in the browser and in my notes. And I need to combine them somehow, comb a little and structure the whole set to make it more accessible. Like, tools, articles, documentation, whatnot.
Currently, I use default browser bookmarking capabilities and divide links by topics (in a deeply nested way). I don't use any specific tools, though I had taken a look at a bunch of them and didn't stop at anything.

What is your way of keeping your bookmarks in order? What tools do you use? How do you structure the whole system? What is your approach to fast access and synchronization?