Web 2.0 is here and there is an ever increasing need of being socially aware of the technologies surrounding us such as Wikis, RSS, Social Networking sites and so on.
To aid us understand them in plain and simple language there are tutorials available on popular video website Youtube for each one of them.
Leelefever Youtube channel provides several such media presentations that are simple to understand and they are really really well presented.
I would highly recommend you to visit the site here to go and check out yourself.
There are several easily understandable video tutorials available for you to view online. Unfortunately I may not be able to embed them here due to potential copy write issues so giving you a link here again.