In my early days of Living in the Clouds, I was using Delicious as my cloud based bookmarking tool. It was my favorite Web 2.0 era tool. I loved it so much that I refused to look at any other social bookmarking apps. When I started blogging here at Cloud Avenue, Zoli recommended us to use another bookmarking site called Diigo for our research purposes. I agreed to use this app very reluctantly and I never looked back since then.
Diigo is not just a social bookmarking site but it is also a very good research tool including options to highlight, annotate, comment, share, etc.. This tool has changed the way I do research on the web with its powerful set of features. In fact, I have stopped using Delicious completely. This is much more powerful than Delicious in my quest to organize my information in the clouds.