Curt Bonk (http://travelinedman.blogspot.com) has published a great book on "Emeging Learning Technologies and th Web 2.0. Best of all, we can participate (it's a WikiBook!) adding stuff.
The Connectivism Course PageFlakes is a goof example (I love it!) of a site easily built for a purpose: help people connect with the course and fellow particiopants. Also, these pages may contain tools and collections of useful links and resources. For instance, by defining a common project tag, one can subscribe top that tag's technorati or delicious feeds, and put them on this page. I am about to use this feature in a couple of courses.