CSS "projection" media type
Recently I have been more and more attracted to the feature-set of Opera. The latest gem I found was "OperaShow", which has apparently been around since the days of Opera 5 (they are on 9.2 at time of writing).
CSS2 defines the "projection" media-type, intended for use in presentations. Most of the same rules apply as with the "print" media-type. (CSS2 spec on paged media).
My next presentation will definitely be done using Opera and completely in HTML. I'd want to invite you all out to open up or download Opera, go to their tutorial and open up the fullscreen mode (F11 on windows).