The need to have this versioning comes from the fact that the business models/ technology on the web are changing.. The web is becoming user driven.. user generated content [Wikipedia], user centred content, content recommended for the user [Findory], user collaboration.. and the list goes on..
Oreilly has a nice article on this.
Here they mention the changing scenarion 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 |
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