This is after a failed plan to use it for Android TV (my girlfriend made the mistake of picking a WebOS TV and I made the mistake of thinking it wouldn't be so bad). The old one was just a little too slow and only did full HD (honestly, it's fine, but if you have a 4k TV it feels kinda silly). Now that the pi4 has a bunch more power and can do 4K at 60Hz, there is another chance for this!

I'm also toying with the idea of using it for sensors. Battery powered air quality sensor to see along my walking route (there is a narrow, busy car passage that I'm curious about), or maybe measuring things like electricity or heater usage in realtime. Having a graph showing you when it gets used a lot might help identify some easy wins, since walking to the basement to check the meter is a little cumbersome. But those are just ideas.