This video explains the right way to roll cables, alternating over- and under-hand loops to maintain the natural curve of the cable. Using this method helps avoid knots, makes it quicker to unravel, reduces wear on the cable and makes it easier to get a clean, symmetrical coil. The video is geared towards audio cables, but applies equally to networking and other types of cabling.
At the end he demonstrates a way to secure the ends without velcro straps, which is useful because straps and ties are less common in the IT world. I don’t think his method works well for stiffer cables, like CAT5, though, so I prefer to run the last 2-3′ through the entire loop, alternating inside and outside, and then slipping the end between two parallel sections to hold it in place.