Ok, here goes, my 2 Cents
You seem to ahve at least one spare stray cable, any spare cables try and route them in places like above DVD drives etc, hidden out of view.
Your IDE ribbon cables ain't doing you any justice, try and get a rounded one, they look nice, don't decrease airflow as much, and you can pretty much get them any lenth you need.
Any cables like SATA, if they have alot of extra lenth to them, just try and neatly tuck them away, things like your power cable, maybe use a cable tie to route it a bit? Hard to explain, but that is my thoughts