Since this thread started, I've been intentionally looking when out in stores. Sure enough, the plastic bottles are taking over. I've also noticed that they are way smaller than the glass bottle I currently have. They look like something you'd find in a Fisher-Price bathroom play set.
Yep, Topgumby thought so too...
http://badgerandblade.com/vb/showthread.php?p=2002908#post2002908