Another neat feature from Opera: OperaShow. Like most web browsers, Opera has a full-screen mode which removes all the menus and toolbars to maximise screen space. What makes Opera special is that it checks the current CSS to look for a @projection media type and uses those stylesheet rules to override the @screen rules. With some judicous use of page-break-after you can convert an HTML document into a presentation with screen-by-screen paging. What an amazingly simple idea!