How to customize Google Docs Form for Custom Thank You Page and Form Validation ?

Below articles are so useful.

http://www.2webvideo.com/blog/customizing-google-docs-form-for-email-validation-with-free-jquery-script

http://whanethewhip.wikidot.com/article:custom-google-form

http://www.morningcopy.com.au/tutorials/how-to-style-google-forms-redux/

http://sneakysheep.com/contact.php