This entry won't be about programming, but still geeky :) I've recently bought a digital clock with projector and I like:
I like to keep an eye on all important parameters of my "system". In Windows, I just install Samurize and setup my config to show graph and current value of: CPU usage, physical memory load, network download/upload, disk read/write bytes/s and system IO bytes/s.
Under Linux/Gnome, I use System Monitor panel, which does similar job.
Similarly, I like to see "parameters" of my environment in real life :) The clock shows current time, date, day of week, as well as temperature and humidity. The equaliser visible at the bottom is a history of temperature difference from previous hours. Projector displays current time on the ceiling or wall, making it visible at night.
There are many kinds of such clocks. One should pay attention to whether it is powered by batteries only, turns on the display highlighting and projector only after pressing some button, or - just like mine - has a power supply and has the highlighting and projector on all the time.