#17 Delicious

I use Delicious all the time. It can be useful in all the contexts mentioned in the task. What I find really useful is that you have all your links together and accessible in one place and that you can build communities of practice/learning by sharing these bookmarks. It also gets me into the habit of tagging the bookmarks which makes it searchable and adds another layer of usefulness, if you like. Once you start creating networks, it can become really interesting and it saves a lot of time if you're after specific information. Just do a search and see what other people have already found on the topic.