The upgrades so far:
Wireless DualShock controllable.
Live streaming webcam mounted on X/Y axis servos to look around.
Raspberry Pi to run the web stream and receive remote orders.
Onboard boombox.
Various software fun.
In the spirit of 80's cartoon show The Centurians, I'm using the Roomba platform as a base to bolt what it needs to be The Doomba!