keys of web 2.0

Do you familiar with these words??

Wikis
Blogs
Tagging

Social bookmarking

Podcasts
Folksonomy
RSS

actually, i only heard some of it 2 or 3 months ago..
mm..its kinda new for me..maybe its not too late to learn about it..
but hurry...web 3.0 is coming!!

For further reading:
What is web 2.0
The best web 2.0