Dancing is an expression of your love for the music and has developed from people having a good time and enjoying a night out. For myself it has become as much of a passion as music itself and producing / mixing.
The best thing about Dubstep nights is the atmosphere and the people (varies from location and venue), whether its somewhere where people are hearing the sound for the first time, or a well known venue (my local being Exodus and the West Indian Centre in Leeds) you will witness a different type of experience at each, and the hypnotic feeling of Sub Low fequencies through a very large and quality soundsystem is a very different and special experience.
I understand why people found Dubstep a difficult sound to dance to at first, but now it should be be an area that people want to explore and develop.
Personnally I enjoy many different styles of dancing to different styles of music.
In a well crowded venue its all about staying grounded and swaying your body whilst finding many different ways to nod your head, whilst if you have the space to express yourself dont be afraid to do so. Remember to juss be relaxed and let the music take hold of you. Anyone can learn to dance aslong as you have rythym and soul.
I used to Breakdance but couldnt keep up with the practice as my DJ'ing took more priority, and to be good at Breakdancing you have to commit to regular training and exercise. Its all about bodypopping, robot dancing and fancy footwork.
Ive seen breakers start bustin moves out to Dubstep, which is totally possible as the music generally falls around 140bpm which is faster than House, Techno and Breakbeat, but the space between beats is wider like with hiphop. I have a passion for good hiphop coming from being a heavy toker and skateboarder in my youth, and although its not my favourite music it is great to dance to, especially when grindin with ladies

and I love cripwalking and developing step moves, which ive recently broke out to Dubstep from having a skank, with the more upbeat tunes bringing most creativity.
Whether standing by the bar nodding your head and listening, clasping onto the speaker stack with your head in the bass bin, throwing shapes like a true raver or breakin moves out like a pro, remember not to worry what people that arent free enough to move with music think, and to respect peoples space around you (especially in a crowded location) Dont be the sweaty guy the causes beef by knocking into a man's girlfriends or spilling peoples drinks!!