Packt Publishers are celebrating the publication of new Microsoft books and are offering an exclusive discount for all Microsoft (SQL Server, SharePoint, Silverlight) books during September 2011. There are several books of interest and I am sure you will find a huge set of helpful ones in that list. Go and grab the discount! Here is the link which explains it in detail: 10 Days of Microsoft SQL Server, Silverlight and SharePoint Books. The campaign for the SQL Server books will be for the first 10 days of the month.