Thank you Klauserus for the feedback. By the way, if your TV is 16:9 flat panel, some TVs have a configurable zoom for 4:3 filling the screen by cropping some lines from top and bottom. Wii also has a 16:9 mode, how is configured your Wii in system settings?
Well, for now we just fill the whole screen, but we could also check for the widescreen flag and add black borders left and right, if this is better (maybe make this configurable)?
Ok my Wii settings are HDTV 16:9 and TV also 16:9. when i switch on tv 4:3, looks like the same.