In case you've missed it, the May 2007 update of SQL Server 2005 Books Online has been made available for download on June 12th.
The 135 MB setup file can be downloaded from this site:
Of course, the online edition has also been updated accordingly.
Also, Windows Live Search now supports SQL Server 2005 Books Online Scoped Search, introducing a much needed way of focusing on relevant subject matter, rather than simply relying on users to provide (or not) additional criteria to the search string (e.g. "SQL Server", "SQL 2005", etc.). Compare scoped search with the 'general' MSDN search.