Primos is web application security testing tool which is capable of performing discovery and exploiting the SQL injection vulnerabilities.
This works with MS SQL Server only and can enumerate databases, tables and data in a very easy to use GUI. It appears to be very fast from a scanning perspective. It requires all requests to be processed as GET requests and might need the use of a proxy to achieve this.
A demo video is available to Primos site.
Download Link: http://www.priamos-project.com/versions.htm
Warning: The tool is identified as Trojan by McAfee Security so use this at your own risk.
Disclaimer: You should only use PRIAMOS or any other tool reviewed here to test the security vulnerabilities of your own web applications.