Several people in the webinar asked about good starting places for some of these new technologies. For you beginners, a good first step would be to educate yourself about the overall concepts. Wikipedia has some good articles on Blogs, RSS Feeds, Wikis, and Social Networking. If you want to dive in headfirst, for each topic I have included a quick definition and a list of sites that use the technology.

Blogs

A blog (an abridgment of the term web log) is a website, usually maintained by an individual, with regular entries of commentary, descriptions of events, or other material such as graphics or video. Entries are commonly displayed in reverse chronological order.

Blogger - Create a blog for free
WordPress - Create a blog for free
Technorati - Blog search engine tracking over 112 million blogs

RSS Feeds

A web feed (or news feed) is a data format used for providing users with frequently updated content. Content distributors syndicate a web feed, thereby allowing users to subscribe to it.

Google Reader - Browse RSS based news feeds
iGoogle - Customizable Feed-based homepage, similar to Pageflakes, NetVibes, and MyYahoo.
Technorati - Search for articles, subscribe to search results as RSS Feed

Wikis

A wiki is a collection of web pages designed to enable anyone who accesses it to contribute or modify content, using a simplified markup language. Wikis are often used to create collaborative websites and to power community websites.

Wikipedia - Free, open content encyclopedia
PBWiki - Create your own free, hosted, password-protected wiki

Social Networking

A social network service uses software to build online social networks for communities of people who share interests and activities or who are interested in exploring the interests and activities of others.

LinkedIn - Professional social networking
Facebook - Social networking
MySpace - Social networking
Twitter - Microblogging service allows users to communicate via short messages