I found this linked off of jeremiah's blog
"As applications evolve, new vulnerabilities emerge. For this Rolling Review series we'll examine how Web application scanners help address the security weaknesses found in RIAs in general, and Ajax in particular."
"Web application scanners can help, but implementation is tricky. For this Rolling Review, we decided that instead of simply focusing on boxed Web application scanners, we'd consider the entire decision-making process. "