We built two retro gaming systems with the kids (one for each) a couple of weeks ago. Honestly, I was disappointed that it was so easy - I was hoping that it would take a bit more work, and there'd be more teachable moments. Literally load the image and go, flawless fun so far.
Re-doing a bunch of stuff in the house over break, so maybe I'll play with one as a wifi-extender or maybe do some arduino projects.

Circuits scares me btw.