"The Wired Up Collection is designed for the professional photographer on assignment to the person that is just beginning to explore the possiblities of digital media."

Another way to significantly improve your audio is by using an external audio recorder on your HDLSR.  Generally speaking, external audio recorders are superior when compared to the internal audio recording devices inside of the camera. Another advantage of external audio recording devices is that they have a headphone jack so that the photographer can “listen” to the sound as it is being recorded, and to hopefully eliminate unwanted sounds.

Another way to significantly improve your audio is by using an external audio recorder.  Newspaper photojournalists and other photographers that are on the run generally prefer small devices, like the  Edirol  R-09HR 

This is very small, portable, can easily be thrown into a bag, and can be used to record either your primary sound or ambient sound, and it can be used for audio interviews as well.  Some photographers prefer simple “ear buds” while others prefer full size “headphones.”

For even greater sound capabilities and control, the Marantz 661  is a top performer.  One HUGE advantage is that both of these have two XLR inputs, as opposed to a mic jack, which will impact your sound quality. It also means you can have to two microphones attached recording sound separately, such as a wireless mic on your subject, and an additional microphone collecting ambient sound.