test and Demonstration site

http://demo.testfire.net/feedback.aspx

http://test.acunetix.com/categories.php

Test sites / testing grounds

SPI Dynamics (live) - http://zero.webappsecurity.com/
Cenzic (live) - http://crackme.cenzic.com/
Watchfire (live) - http://demo.testfire.net/
Acunetix (live) - http://testphp.acunetix.com/ http://testasp.acunetix.com http://testaspnet.acunetix.com
WebMaven / Buggy Bank (includes live testsite) - http://www.mavensecurity.com/webmaven
Foundstone SASS tools - http://www.foundstone.com/index.htm?subnav=resources/navigation.htm&subcontent=/resources/s3i_tools.htm
OWASP WebGoat - http://www.owasp.org/index.php/OWASP_WebGoat_Project
OWASP SiteGenerator - http://www.owasp.org/index.php/Owasp_SiteGenerator
Stanford SecuriBench - http://suif.stanford.edu/~livshits/securibench/
SecuriBench Micro - http://suif.stanford.edu/~livshits/work/securibench-micro/