Web 3.0

Web3.0 will be the migration to mobile devices as a major platform.

in order to know about web 3.0, you should know what web 2.0 stands for.

and for this, check my answer about web 2.0

in short, in web 3.0, or semantic web, the computer will be able to understand on its own what is the information you have is about, and do things with it according to its meaning.

just think about the ways you can understand the content of a web site you are using; looking at movies and pictures and knowing what u see in them, reading an article and understanding what the subject is, and so on. in the future, your computer will have many of this abilites too. 

I see the Web moving in a couple of differnet but related directions. The first, as hornbeck pointed out, is the migration of the Web to the mobile on the one hand and the television on the other. I don't see mobile and TV as separate platforms for the Web however; I think they will be an extension of the Internet. You will be able to get the internet experience you want but extended to your mobile device or on your TV.

In a grander sense, we will move towards a world where there will be internet more or less everywhere you go at all times. 

The Web will probably shift to be the focus of most peoples' home entertainment as well. We see the first seeds of this happening with services like YouTube and Last.fm. Eventually, you will be able to decide what you want to see or hear, when you want it and get it delivered to whatever device is most convenient for it.

Web 3.0 should also be "smarter" than Web 2.0. You will be able to find information a lot more quickly and easily than you do today with Google and other search engines. 

I like all these answers so far - extending to mobile devices

I saw a documentary the other day where a service stored 1000's and 1000's of pictures of a city in it's server.

People take a photo of a landmark with their mobile and send it to this server, which matches the photo with one in it's store and then sends the recipient information (eg. history) about that landmark.

I suppose web 2.0 is alot about the social web, but it's also been about the platform and technologies that enable mashups, re-syndication, etc...

Is web 3.0 going to be the semantic web, that's probably web 8.0 or web never.

A feature of Web 3.0 could be services like Dapper and Ning which goes beyond Read/Write, it's more Create/Read/Write.

With Ning non-techies can create applications, with Dapper you can mashup them up

Is Web 3.0 the equivalent of Web 2.0 for the enterprise?

Interesting question.

More information in this great Wiki that tracks this issue

http://www.socialtext.net/web3/index.cgi

Web 3.0 – This will be about semantic web (or the meaning of data), personalization (e.g. iGoogle), intelligent search and behavioral advertising among other things.