this app lets you use a composite out from your iphone dock connector to rca video. its amazing and so far works great

<object width="400" height="307"><param name="allowfullscreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="movie" value="http://vimeo.com/moogaloop.swf?clip_id=3492418&amp;server=vimeo.com &amp;show_title=1&amp;show_byline=1&amp;show_portr ait=0&amp;color=&amp;fullscreen=1" /><embed src="http://vimeo.com/moogaloop.swf?clip_id=3492418&amp;server=vimeo.com &amp;show_title=1&amp;show_byline=1&amp;show_portr ait=0&amp;color=&amp;fullscreen=1" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" width="400" height="307"></embed></object><br /><a href="http://vimeo.com/3492418">More ways to tether your iPhone to your car</a> from <a href="http://vimeo.com/user866882">Robert Wray</a> on <a href="http://vimeo.com">Vimeo</a>.