PI-hole
The PI Rack has a new Raspberry PI running PI-hole, a DNS Server that strips out advertizing and acts as a tracker-blocker. Wikipedia explains it better.
Not much to say except is was real easy to install and set up. I did configure it to boot off of a USB flash drive, which any PI owner knows, was not possible in the recent past having to boot off of a Micro SD card.
The PI-hole is the third from the left with the green Ethernet cable.