After reading some articles and blogs, I found that Web 2.0 is not really new thing. It's just a milestone that saying the internet has evolved into new phases. People are not working alone but collaborated. XML and HTTP make different platforms more integrated comparing to the DCOM and COBRA. Thanks to AJAX, web applications are almost as dynamic as desktop applications. Whenever you go, whereever your are. You can access the application with your electronic devices (mobile phone, PC, PDA, etc). No more deployment and update patches is need.
If Web 2.0 is a milestone, what else we can do with it? Just celerbrate and get back to work! Have we rearched the milestone yet? Not really! Let's work harder for it.