A collection of web app security links with focus on ASP.NET:
OWASP – The Open Web Application Security project is a worldwide community of professionals interested in security and a good starting point for securing your web apps. Some of the topics: Vulnerability, .NET Project, Cheat sheets, .NET Security Cheat Sheet.
Troy Hunt – MS MVP, blogger and security expert. I really like his stuff. Take the list of topics of his Hack Yourself First workshop as inspiration, check out his Pluralsight courses and sign up for his newsletter. Love one of his recent posts Passwords Evolved: Authentication Guidance for the Modern Era.
Ten Immutable Laws Of Security (Version 2.0) – Security philosophy 101 from Microsoft. Makes you think.
.NET Blog – General and security-related information.
My own blog entries about security.