Following are my all time favorites web pages I frequently visit for remaining up-to-date with web application security:
Website I frequently visit to check out videos, presentations, Books etc.
Website about building security in maturity model
Website representing Web Application Security Consortium that publishes technical information, contributed articles, security guidelines, and other useful documentation. Businesses, educational institutions, governments, application developers, security professionals, and software vendors all over the world utilize their materials to assist with the challenges presented by web application security.