After a three month hiatus, Google has brought back Author Stats to Google Webmaster Tools.
I personally noticed it yesterday when I was playing around with my Google Webmaster Tools account.
Author stats shows you statistics for pages for which you are the verified author. So I can see stats from this site, Search Engine Land and other sites I write at where my Google Authorship is verified.
Here is a screen shot of the stats starting to accumulate again:
Just some history, this feature was initially introduced in December 2011 then went away in April 2012 and is now back in July 2012.
Forum discussion at Google+.