I am looking to start a web-based business that involves building a community. I am trying to come up to speed on all the technologies (content management systems, software as a service, Web 2.0, etc.) so I can be involved in making technology choices, working with a web design/development company.

Where can I get a reasonably good view of the current state of the web, and a discussion of these new terms? I am looking for an downloadable document, or a buy that I can buy.

Thanks all!