Whats this hype about? web 2.0. Is is a new technology or an advancement of html

In layman's terms, it's just a catch phrase like AJAX and LAMP. Cool name to describe "the new web interface" as in, making web apps richer (as in more closely mimic a desktop app).

I hope this helps.

Hello,

Regarding Web 2.0, In addition to making Web Applications "more like desktop apps", there are some key features that should be taken note of, they include;

1. Eliminating browser content re-drawing: This is evident when you request a page and your screen goes blank or flickers for a while.
2. Increasing Accessibility: The Internet is now more accessible, many devices e.t.c. Using Web 2.0 techniques, you can build your web apps to suit multiple devices.
3. There's actually much more but I'll suggest you try out Yahoo! Mail Beta, Google Suggest and Gmail. These should give a picture of what to expect from Web 2.0 apps.