Microsoft Source Code Analyzer for SQL Injection tool
This looks interesting. We just published a tool for to find SQL injection vulnerabilities in ASP code (not ASP.NET). Check http://support.microsoft.com/kb/954476 for more information. You can download from here
At the same time checkout http://www.microsoft.com/technet/security/advisory/954462.mspx for some other tools like HP Srawlr and UrlScan.