Interesting. It appears that Google Book Search hasn’t added any new books since the end of December 2009. Or at least, it looks that way if you filter by date. Go to Book Search, select Custom Range… 1/1/2010 to 10/10/2011. Select a common term such as “author” or “genre” or “2011”. No results whatsoever, except from U.S. magazines. The search-by-date function seems to be broken, as searching for “2011”, without a date range set in the sidebar, throws up textbooks published in mid 2010 and late 2010 (e.g.: such as “Microsoft Office 2011 for Mac: Visual QuickStart”).