I am going to talk a little about del.icio.us online bookmarking site and show you a few tricks on how to make it work for you.
While teaching a blogging class the other day I was explaining about feed readers and I showed some teachers Del.icio.us and how you could actually have feeds set up to work for you. An example would be to type in a URL like this: http://del.icio.us/tag/scotland then look at the bottom of the page for the orange RSS button. If you right click on it and go to properties you can copy the link into your news aggregator (feed reader) and as people add links to their del.icio.us accounts tagged scotland, you will see those links as a feed. You can also do the same thing but add another criteria to the search http://del.icio.us/tag/scotland+history you can narrow down the search to items tagged scotland and history.
If I wanted to keep up with what sites are popular on a particular subject I could type http://del.icio.us/rss/popular/scotland and this would generate the most popular links tagged on del.icio.us for scotland.
You can do the same thing with people instead of tags. If you have someone who is in your “circle of learning” you can subscribe to their tags (unless they have designated them private).
These and other tips can be found at Likehack.org if you would like to read more.