already available in kmeleon before chrome was even conceived.. have you tried it? drag and drop the tabs all you want, the dragged tab will push the other tab behind.. only there's no 'eye-candy'. to dublicate a tab, simply drag it into an empty space in the tabbar.. to detach a tab, right-click a tab button and select detach.
Right-click the tab - Detach Tab. If 2 clicks is too much for ya, then you can setup a mouse gesture for it to "drag". You don't even need to start dragging at the tab. To set it up: