First of all what's "Web 1.0"?
This generally refers to the state of what the Web was primarily used for: a (mostly) consume-only service to access information. Even with all the many applications surfaced through the Web, the majority of the Web is still site for reading, gathering, and consuming information. The number of consumers is much greater than the number of producers.
To make the distinction, the thought behind "Web 2.0" is to instead make "producers" out of the majority of the users of the Web. Now, users not only visit the Web to gain information but also can contribute to the wealth of information that's out there.
It's a democratization of the Web if you will, allowing people not just to express their thoughts on their work, their lives, their emotions, etc. It is not just creating new written content, but contributing by taking existing data and "remixing" them to produce new content. It is also building application services that can work on data or app services that others produce.
Thus in the new world of "Web 2.0", people become producers of original and remixed data, content, and services.
There are quite a few books coming out around the topic of Web 2.0 and by leading literary minds like Dan Gilmor, and Thomas L Friedman. The topic is related to a number of ideas that can raise a lot of controversy including: freedom of expression, ownership of material produced, the right to use information and services of others, legal liability, and even globalization.
Web 2.0 existed from the very beginning of the Web itself, at least in concept. You could create home pages from very early on and even HTTP had rudimentary means to PUT and POST data. However, it was not until the rise of newer technologies that put it into the hands of the masses, and acknowledged significant impact on real-world issues that it really hit the mainstream.
With such a hotbed of activity, its no wonder that everyone wants to know more about how it applies to what they do:
- producers want to learn how to use the various technologies in this.
- developers want to know how to build variations or new ideas around this.
- marketers want to know how to take advantage of the populations that arise from this.
- companies want to know how to handle this in terms of their PR/communications channels, legal staff, and just how to react to any of this.
As with any "gold rush", everyone is out to claim their stake in this. For some this rush is about new software. For others its about making yourself heard (and famous). For yet others, its about connecting with others of like mind.
Some common aspects I've observed:
- user-produced content and services
- interactive and collaborative environments
- standards-based access to application services
- the ability to remix content, data and services from sources across the net
- the rise of user-driven communities