It's hard to believe, but since just under a month ago I have been over 30 years of age. But so too has the world wide web.
I was discussing this yesterday with someone and discussing how the w3 has evolved from being a simple document sharing system into something that allows you to build and use powerful applications within it. I say this because on Monday I went to one of my favourite restaurants and they use a web app to manage everything, and I say everything. It's very impressive.
Anyway, take a look at How To Geek for more information on this: