Shoutbox

The adbar can only be hidden by a patch. Patchou has his reasons for removing the ad-hide feature (search the forums: shouldn't be hard to find).

As for hiding formatting options, you can hide the bar. Press Alt to show the menu bar, then select Tools > Show Toolbars. You can also turn off the icons at the top.

As for removing them one by one: I don't think anyone's written anything to do that yet.