rlange - 7:23 pm on Jul 7, 2011 (gmt 0)
I never got the impression it would display the count in the SERPs, does it?
That's a logged-in search, but it also displays while logged out.
I've seen only a few, mostly attached to Google properties like WMT here, or the blog post announcing Google+. Wikipedia also has a count attached to the search result for its main page (a measly 1,675 or so).
Interestingly, the count displayed on the SERPs isn't fixed. I just refreshed the results for "webmaster tools" and it displayed a count of nearly 49K. On some refreshes it displays a count around 19K and on others it doesn't display a count at all.