i find that if you take 'different' pictures from the norm, its alot more interesting. I sometimes lie on the ground, right close to where the front wheel is going to be, or try and get close but above your subject (not always possible, and you have to really trust your subject) As for settings, i use sports mode and leave it at that, you can follow the bike as you take the shot so the background will be blury. there is all sorts of things you can do to take good shots. But as he says, a good shot is in the eye of yourself.
happy pictures