I have been using Delicious for a long time, but lately I have started using Google Reader more and more, basically because I can share items without having to open the site.
But yesterday I found out that I can make my links in Delicious available in Quicksilver, which means that I have a ton of information available with just a few keyboard clics. Instantly I am very interested in Delicious again, and surely will start bookmarking more sites again.
