Stew's using his litterbox properly now! I guess his bunny feng shui said he had to eliminate in the west end of his house. Moving the box there worked, and he still lounges around in it.
Stew is pretty skittish when he's out for play time, but he does enjoy driving Caspian crazy by running around outside of Caspian's house. Stew also does a half-binky salad dance every morning when it's breakfast time, and he'll stand up on tippy toe for quite a while to be petted before getting his greens. Talk about buttering me up for food!