There are actually many ways and they usually include lots of layers! In a nutshell I'd say using gentle gradiations and overlay blending for background layers. You don't have to use the gradient tool, just a large paintbrush with low opacity and keep adding piece by piece for the brush. For the lines and such you can use the pen tool to get the curves or even apply some transformations to a straight line with a decent width. Add some motion / radical / gausian blurs where you want them and keep experimenting to get what you want. Keep it simple, good composition and layout are definately the most important parts to think about before you even get into photoshop, but the beauty about that is... you can move it all around! cheers.
Hmm I see, I suppose experimentation is the key, I've found out a few new things about photoshop since i started using it so I guess things of of this quality will come, eventually..! You must be very patient to draw those faultless lines with the pen tool, 'fraid my patience is always limited.. Anywho, keep up the great work, well done mate