You started a nearly identical thread in January:
http://igkt.net/sm/index.php?topic=2731.0I usually find myself tying a slipped Half Hitch. Then I tie a second Half Hitch on that slip, then a third Half Hitch...and so on until the extra rope is taken up. I usually wrap the Half Hitches around all strands of rope. If instead I have many feet of rope left, I'll probably tie the slipped Two Half Hitches and then coil the remainder somehow.
It's important to note that I start the slip on the first Half Hitch. If there is a lot of tension, that first Half Hitch can be difficult to untie if I didn't slip it. There are other fancier solutions (like Round Turns around the second anchor, etc.), but I have found the Half Hitches work just as well.