Furniture markers. They sound like one of those late-night infomercial products - but they do work (mostly).
If you're scrutinizing the table for scratches you will still see them - but scratches that are obvious from the sofa will be no more!
Here are some before/after pics to show you how it works:
(Those first scratches are thanks to cats sliding across the furniture and the latter ones are thanks to a laptop being pulled on and off the table.)
Here is the kit I have - available on Amazon.com: Guardsman Touch-Up Pens They come in three shades - though I've noticed other kits that contain more shades.