Anyone use it before??? I was walking into a BB&B with Viv yesterday and noticed this stuff in the "earthquake kits" section... I think it's just white tack that you roll into a ball and place under whatever items you have on shelves and such to prevent them from easily falling over... 'Course it won't prevent anything from falling over in a big 'quake, but it seems like it would work for smaller shake ups or mishaps... I was concerned on whether or not the stuff would discolor the plastic on TFs though... Anyone know???