To some, RSS Feeds, Wikis, Social Bookmarking, and Social Networking sites are a part of every day life. To others, they are a bit of a mystery. You may know a little about them and not think they can would be useful for you. You may not have any bells ringing at all upon reading those words. Chances are, they are a lot more useful to you than you may think.
Looking online for information about these tools can often be a bit daunting. I came across a great set of videos by commoncraft.com that gives a really good explanation in plain english of what RSS Feeds, Wikis, Social Bookmarking and Networking sites are and how you can benefit from using them.
http://www.articulate.com/community/blogdemo/web2/engage.html