Here is a brand-new function for Pearltrees (the innovative tool that "lets you organize, discover and share the stuff you like on the web") which I have been using regularly for the last few months.
I find it incredibly useful and empowering. If you click any "pearl" of my pearltree it will activate the browser mode in an overlay. Enjoy going through it and, if you like, consider using it yourself. Go to: http://www.pearltrees.com