I've just posted a short article on social bookmarking.
I'm not going to repeat here what is in the article but this is how it started out and I suspect the same happens to a lot of people: You hear a buzz about a new technology or a new cool gadget. You're not quite sure what it does, how it could help you and any time you hear about it or read about it, you're still not quite sure you're getting the full picture. The only way to get to that point where you can tell whether it's going to be useful to you is by trying it out.
And so I tried social bookmarking a while ago. The short article I posted in the Articles section of the website highlights what I've learned testing out FURL. It doesn't attempt to compare FURL to any other tool. All the social bookmarking tools sufficiently similar that you can just pick one and run with it.
And if you want to take a look at the types of resources I bookmark, check it out in my FURL Archives.