Here's one I threw together. It's entirely CSS-based, works in everything except IE6 (there's a bug where the sidebar content doesn't show -- something to do with relative positioning i think). The code is also pretty well organized.
Anyway, if anybody likes/wants it, or if you all want to throw it into the list of official templates, just ask and I'll supply you with the code.
It could use some beveled edges on the tabs, some more shadowing, gradients, and maybe some other things.
Anyway, have fun

Post this back here if you make any changes, and I request that you also give credit to me, Chad Johnson (chaddjohnsongmail.com).