That's exactly the point. It is not difficult to maintain the 'style theme' of the original promo material.
Just a various print formats can maintain a theme while presenting material 'optimized' for each particular print format (notecard handouts, triple fold pamphlets, or multipage brochures), so can web pages. And, without resorting to "sniff 'n serve" (sounds like a questionable meal... and it IS!).
Also... perhaps even more important is the need to consider the growing number of 'small screen Internet devices.' Even here, you do not have to create 'versions' of each page. If you haven't tried out Opera 7's SMALL SCREEN RENDERING format, you are missing out on valuable insight of the coming wave.