Change login page for spring security plugin in grails
The 2.0 plugin comes with its own auth.gsp page, so if you create your own (either modify the plugin's or create your own) and put it in grails-app/views/login/auth.gsp it will be used. In 1.2.x the auth.gsp is in your app source, so edit it there.
If you want to further customize the login process, I did a talk at http://burtbeckwith.com/blog/?p=1090 and there's some sample code that adds a 3rd login parameter. That code is based on the 1.2.x plugin and would need to be updated for 2.0, but the ideas are the same.
I copied the file auth.gsp from here:
to grails-app/views/login/auth.gsp