Replace notification bar The default notification bar in Nexus S is very basic. It doesn't have any toggle buttons like others do. Can I replace it?
From what I've seen this is not generally very easy to do. I know that replacing the icons and such requires modifying the underlying framework-res.apk file, and I've never really seen anything that modifies the functionality of the bar itself (aside from custom ROMs with custom frameworks and the like). I'm not completely positive on this, however.

If you just want to get the toggles, though, you could try an app like Notification Toggle. It says that it's a little bit hit-or-miss depending on the device, but I'd imagine that the Nexus S would be on the better end of the scale.