Technorati is a site that I had visited during a previous assignment. I really struggled learning the use of the site. For this reason I can't see using this in a classroom environment. I think that it would be difficult for my students to grasp the concept and I don't believe that my teachers would have the patience to learn. I found Delicious to be MUCH more user friendly because of its simplicity.
Tagging with Delicious has provided me with experience in bookmarking. I can see its use for categorizing information and topics.