There are many ways to keep computer cables from getting tangled
up. One easy way is to use twisty ties, from bread bags etc., by
winding the excess cords up and then securing with a twisty tie.
There are also many products available to purchase that can prevent
cables from being tangled up.
There are alot of ways to do this, but check out these 10 tips
here,
http://lifehacker.com/364054/top-10-ways-to-get-cables-under-control.
Personally aim for getting cables that serve purpose, and if you
can get it wireless, do so.