The resourceful folks over at RocketTheme have released a very nice Web 2.0 looking Joomla template under the GNU/GPL license. It’s called RokWebify. It seems that this is the basis for a series of tutorials they’re releasing on customising their templates.
I used to be a member of their template club (let my membership lapse – unfortunately), and they create awesome templates, as well as great tutorials. This one here is no exception.