Being able to attach and reattach consoles is cool. While I worked at Broadcom, I developed a kernel patch (whatever happened to it) which allowed you to have a stable serial console via a USB dongle.

I was able to unplug the USB-serial adapter from the embedded device's USB port. Then plug in a different USB-serial adapter (different chip requiring a different driver). It would obtain the same /dev/ttyUSB<n> device, and you would be back in your session intact. If you were in the middle of a vi edit, you could just Ctrl-L to refresh the screen and keep going.