Cable management

Tie wraps and little nails or those eye-hooks. Cheap and dirty.

"Hanging all over the place" is probably better, from an electrical point of view, than neatly bundled together. Just keep signal wires away from power. If neatness is the prime requirement, use plastic wire ties (at Radio Shack or the local hardware store).

Wire ties...various sizes available at hardware, electronics, and auto supply stores. As Thedautch said, keep power cords separate from speaker cables and I.C.'s!

Lots of racks have cable management systems. Some great looking ones are form Bell'o and bdiusa.com. Great selections and great designs.

One other comment. If you have to have power cords near ICs then make sure they cross at right angles or as close as possible to this. Having the cords at right angles (perpendicular) to each other reduces, if not elimimates EMF (electromagnetic force).