I finally got around to my annual plant tally this week, and here are the results:
Type of Plant/Number of Plant
Lithops: 48. About a third now live outdoors in the ground rather than in pots. The seem to like it out there.
This includes quite a few Pleiospilos, Aloinopsis, Argyroderma, Marlothistella, and of course, Babytoes (Fenestraria). Others, too. About half live indoors, and half live outside.