Furl has been around for a while--I had an account, but really haven't used them much. When they came on the scene, I was using and working for Spurl.
Generally speaking, I'd say in many ways furl would be superior to the Times for saving articles, as it would allow you to save web pages/articles from all over the web, not limiting you to just one website. If I recall correctly, furl goes beyond simply bookmarking--it does actually save a copy of the page itself.
What is it you want to know about them? I'm sure someone here has more experience than I do but they'd be better equipped to answer your question(s) if they had a better idea what you wanted know.