The New York-based Photo District News (PDN) holds an annual contest for the supposedly better submissions in this category. If you want a crash course in the subject, check out their selections at: http://www.pdnevents.com/topknots05. (Personally, I loath competitions as they generally promote amateurism and mediocrity through extremely narrow perceptions of excellency. After visiting many websites, the images many wedding photogs may be artistic but are not always personable.)
The current popularity of the photojournalistic approach has much freedom to offer wedding photogs. Yet, traditional compositions are valuable to create and learn from for classic images any client will appreciate. Look at this stuff but be Mule-like - consider what others do to affect the way your creativity is utilized and raise the bar of personal expectations as high as each assignment offers the opportunity.
Photography is Art!