WallRX: Fill Those Wall Holes Easy -from the Shark Tank
Ok - I just saw this product on the Shark Tank and thought is was absolutely brilliant (as did the sharks, as seen by the feeding frenzy to back the company): WallRX
You can watch a demo here
Basically, it is a product that lets you fill wall holes up to 4 inches in just seconds. I know this is one for every landlords' toolkit.