Web 2.0

Nobody has been able to clearly define web 2.0. It sounds more like a markeiting buzzword, but its meaning hasnt quite been established. To me it sounds like the usage of various resources on the web as a platform.

I think this sums it up.
[Link from oreilly]

Web 2.0 is the era when people have come to realize that it's not the software that enables the web that matters so much as the services that are delivered over the web. Web 1.0 was the era when people could think that Netscape (a software company) was the contender for the computer industry crown; Web 2.0 is the era when people are recognizing that leadership in the computer industry has passed from traditional software companies to a new kind of internet service company. The net has replaced the PC as the platform that matters, just as the PC replaced the mainframe and minicomputer.

Here is an example.
[Link from oreilly]

This article is an attempt to clarify just what we mean by Web 2.0.In our initial brainstorming, we formulated our sense of Web 2.0 by example:
Web 1.0 Web 2.0
DoubleClick --> Google AdSense
Ofoto --> Flickr
Akamai --> BitTorrent
mp3.com --> Napster
Britannica Online --> Wikipedia
personal websites --> blogging
evite --> upcoming.org and EVDB
domain name speculation --> search engine optimization
page views --> cost per click
screen scraping --> web services
publishing --> participation
content management systems --> wikis
directories (taxonomy) --> tagging ("folksonomy")
stickiness --> syndication

An finally a picture.
[An Image From oreilly] (click to see)

Hope this helps.
-Dwight