I love my little Raspberry Pi. The $35 computer has a ton of uses, from the utilitarian to the hobby project. But in practice, how many of us are going to build a homebrewed Amazon Echo? My guess is not many. But there is one use for a Pi that I've been a big fan of for almost a year: a simple DNS server.
DNS and dnsmasq
By making DNS requests from a local Raspberry Pi instead of a remote server, you can realize a few advantages. Fetching any kind of data from a local area network will always be faster than fetching something from the Internet.