I certainly agree that the amount of vulnerabilities is increasing and you have to be able to write tools by yourself to complete the required aspects for auditing web applications because current frameworks and vulnerability scanners doesn't cover all critical possibilities.

There was an excellent conference at Blackhat about python as a tool to develop tools to test web application security. Find the video here: http://securitytube.net/Offensive-Python-for-Web-Hackers-%28Blackhat%29-video.aspx

-- Manuel Humberto Santander Peláez | http://twitter.com/manuelsantander | http://manuel.santander.name | msantand at isc dot sans dot org