For the Scientific Homebrewer:
The Blichmann BrewVision with bluetooth sensors and an app for your smart phone helps you monitor your brew day.
Looking for a stocking stuffer? The Periodic Table of Beer Styles is always fun:
Oxygen is key to healthy fermentation. Check out these Aerator Pumps with sanitary filter and 2 micron stainless steel stone.
Mash pH is an oft-neglected measurement but can make a big difference. A pH meter will help!