OnJava.com have a great article about where the web and webpages as we have known them up until this point are heading and how web technologies are evolving.
Web2.0 is not any one or a collection of technology standards, but rather an evolved (and evolving) way of thinking about how the web can be used to achieve goals. The changes are subtle but noticible. In most cases Web2.0 encompases how evolving web based technologies are being used to enhance the user experience on the web, with the trend towards collaboration, sharing and community driven sites and community interaction.
For example, mid-90s personal web sites were ‘the thing’ for self-promotion and telling the world about yourself, your hobbies and your cat. Mid-90s personal websites were typically static sites. Today, ‘the thing’ for publishing personal information is the weblog, or blog as it has come to be known. Blogs are now dynamic, growing and living sites, regularly updated with new information as the author updates it. The end goal is somewhat similar, but the use of the internet and web technologies to achieve it has evolved.
This section below is taken from the article “what it Web 2.0” on OnJava.com site:
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
In most cases you see that the goal has remained the same, but the evolution of technology has allowed the goal to be achieved in a different way taking advantage of the new technology.
This is an excellent article and well worth a read.