ARRRRRGH I was almost finished on a long responce when I opened a new tab to double check a fact and firefox crashed
So I'll break it up this time
Well the first thing to do is becareful of camera shake, that's why your first two pic are blurry, most digital cameras have an option on them to take multiple shots, ie every time you take a picture it actually takes 2 or more always handy as one will often be better than the others.
You need to keep working of the cables, it is a bit of a mess there, try takeing off the both the side panels then you should be able to run the power cables for the motherboard behind the motherboard tray and feed them back through the holes in the tray so they are not snakeing up over the motherboard.
You can safely fold a ribon cable through 45 degrees and more than once along it's length, with a bit of planed ribbon cable origami you can generaly get them laying flat along the sides of the case which can help keep things neat.
Just don't fold, unfold and refold in the same place as then you can break the wires, so plan before folding.
Once folded you can then use bits of double sided tape to hold them down.
If you have two drives next to eachother off one cable (a master and slave) you can tuck the excess length inbetween the two drives to keep it out of the way.
If you have excess length you can fold the ribbon cable back over it self (so it looks like a flatterned S from the side) you can secure the fold and keep it flat by wrapping tape around it.
I've found once you learn how to fold ribbon cable it can then be far eaiser than round IDE cables simply because round ide cables are not very flexable.
Zip ties are good for tieing cables together in bunches or tieing them to the case to keep them neat, if you don't have any to hand then don't worry too much a simple bag tie work just as well (and you should have a few kicking about from all the packageing
)
One main thing is that I find cable tidying is a more of an art form than a science, you may have to uncable half or more of it and start again and do it more than once to get it right.