web 2.0 provides the user with the opportunity  to interact and collaborate with other users . this is the opposite of what was happened in web 1.0 where the user was only a passive receiver of content 

web 2.0 have a great impact on education and there are a lot of tools that are very useful for teachers such as

Dropbox  

it is a very useful tool for teachers where teacher can share documents with his students

Google Calender

 it is great for planning lessons and keep track of the due dates of students homework

Testmoz

teacher can build full test  in a minute

Google Talk

it is an instant message program 

Podomatic

it enable teachers to create and upload their own podcasts

 

and there are a lot of tools that we can integrate it in teaching and i will talk about them in another blogs