Semantic web is the future. I assume the coming era will be of semantic web.
I found a really good presentation that well describes web 1.0, web 2.0 and web 3.0 in detail with suitable examples.It’s a must watch presentation for Web designers, developers, planners, architects and IT businessmen.Presentation by: Hatem Mahmoud.
Semantic Web a simple description:
The semantic web stack described by Wikipedia:
Another good presentation on web evolution from web 0 to web 3.0 by Liam O'Morain
can be found on youtube:
For developers here is :