web 2.0 can be basically said people generated content in simple terms.Web 1.0 the control of the content of a site used to be with the webmasters but the concept of web 2.0 is sharing,submitting information by wikis,photosharing ,social networking,rss feeds by people & users.
Web 2.0 is an ideology, and many view it as people attempting to create a new .com bubble. Basically, web 2.0 apps are more dynamic rather than static
some sites can be seen which has added some features and trying to make a transition to web 2.0
Many funny & humor sites have gone this way . Sites like
Ebaumworld used to have only pictures & videos to view ..now a user can share those by embedding them in blogs or other sites ,also users can submit their content .its like making the site more interactive to the users.
Ecard portals like 123greetings.com has also added some features like rss feeds, sharing ecards as bookmarks ,also have the the option to distribute the ecards as photo comments & video comments