New World Notes’ Wagner picked up on the high number of SL residents using the Emerald Viewer. See the article there: Shock Stat: Nearly 1 in 3 Second Life Users Reportedly Use the Emerald Third Party Viewer!
I suppose it would be a “kind of” surprise to anyone not using Emerald or the newer SL 2 Viewer. In older viewers one cannot see the viewer names in Avatar Name tags. Those people not using a newer viewer would be surprised that ‘so many’ people are using the Emerald Viewer. However, I am surprised the number is ‘so low’ …well less than I expected. I usually use the Emerald Viewer and if not Emerald then I’m using Kirsten’s Viewer. In both of those I can see the viewer name in avatar names.