What's the difference between Web 2.0 and Web 3.0?

i hope this will help you http://www.cruzine.com/2011/02/14/web-3-web-2-standards/

Web2.0 refers to the current generation of the Internet wherein websites provide applications facilitating interactive information sharing with a user-centered design.
A few examples include online social networks (Twitter, LinkedIn, YouTube), wikis, blogs, GoogleDocs, etc.
Web2.0 tools are those you'll hear about in today's offices.
Web3.0 is a semantic term denoting the next phase of internet programming that some are calling "the intelligent web".
Think artificial intelligence technologies.
http://wiki.answers.com/Q/What_is_the_difference_between_Web_2.0_and_Web_3.0

its more advance then ever .. more likely people would call it personal assistant he will work for you and sort out the best results from your offline and online data .. if you gonna watch the movie to the nearest cinema with your friends and plus the dinner so the web3.0 will show the result according to your likes and dislikes through your previously used data then it takes your current location and sort out the nearest cinema along with the restaurant so it will be like your assistant i guess  (my personal view)