I feel the best way to make your case look good through cable tidying (although XMS will disagree) is to make sure nothing covers the motherboard or anything in front of it.
The small things like HSF cables can be routed behind the actualy heatsink.
ATX power cables should be pulled tight and the slack should be kept near the top of the case.
use the floor of your case effectively. This is true for graphics cards fans especially. route the molex connector under the card itself, to the back of your case then along the floor of your case providing you have enough wire (I have extensions for this)
IDE cables slack should be stored in the drive bays or under them and any slack from the top ones should go at the top of the case.
Optical power cables slack should also be stored at the top of your case.
once you have routed the cables where you want them to go, use cables ties to tie them all together. tie them to drive bays, each other and anything that will hold it to the side of the case or where you want it.
USB headers and front panel conectors slack can all be stored behind the motherboard, just use sellotape for this.
any case fan wires should all be routed around the edges of your case to avoid a cluttered look.
the main points to abide by....
any slack cn be stored at the top of your case if possible and then be made to look good up there with cable ties.
NEVER route a wire directly across the motherboard unless you HAVE to, always use the outside of your case.
and finally USE CABLES TIES! they are truely sent from god.
damn this better help or ive just wasted 15mins of my life.
here is my beauty....