Web 2.0 : Tools we can use to improve our use of internet

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We can find many different resources to do what we want, web 2.0 uses the tools that already exist before; but in a different manner, web 2.0 try to make the use of internet more easy for all, the concept of web 2.0 allows us to work using many different programs with no necessity of install nothing in our computers, we do not need to know almost nothing about internet languages or so on to use these tools, the web day by day becomes more friendly.
Concepts like blogs, tags, web-based programs, community, feedback, etc. becomes more and more popular with the time, even when the concept of web 2.0 is not new, now, the vast majority of people don't know what exactly is Web 2.0 and how to use the tools that exist. Here I posted a presentation in PowerPoint I found in Slideshare, if you like you can here the audio presentation also, you just have to press Play. Do I have to be a webmaster to make things like this?. The answer is NO. you just need to be curious.
note: The presentation was by The UM Health Sciences Libraries, and the audio is by the School of Dentistry