Creating that Web 2.0 look?

[Spider]

When I look at some site designs (http://publicbeta.asp.net/ for example) and see the rounded corders, the gadient headers etc. etc. I often wonder how they achive this type of look, as its something I'd like to recreate. In the above example, how would you create a 'container' such as the ones they use, with rounded corners, a gradient background for the header and a small gradient behind the top of the content text?
I first thought it may just be an image (would solve the rounded corners question), but they boxes are of differing widths, then i thought it may be CSS, or perhaps a combination of the two?

Anyone know of any good resources that show you how to create this type of WEB2.0 effect?

Thanks

 

[Spider]

Who the hell coined Web 2.0 anyway... 2.0 implies it has replaced other version... which it hasn't.

(Rhetoric, I know it was O'Reilly... I think)

I hate the term too, but most people knows the type of design the term implies...