I really like twist ties. Every time I get an electronic device, I save all the coated ties used in the packaging and curl them up into little coils to use for future organizational needs. But now that I've found these two products, I may not need to keep hoarding all those twist ties!
These bungee cords (found at Bed Bath & Beyond) can be used for a lot of purposes. I think they'd be great for traveling--to keep all your cords and chargers with your electronics.
These GearTie are thick, pliable, plastic-coated wires that you can use to wrap up cords, shape into loops, etc. I like that they come in various sizes and colors. Available at Target.