How to create Sign up forms?

Signup forms is to create a permanent relationship between user and site.

Other experts articles on how to create sign up forms:

• Problems with sign up forms by Luke Wroblewski, which was recently published on A List Apart:http://www.alistapart.com/articles/signupforms
• Jared Spool on Sign up forms: UIE:http://www.uie.com/articles/account_design_mistakes/http://www.uie.com/articles/account_design_mistakes_part2/and
• Adaptive Path:http://www.adaptivepath.com/ideas/reports/signup/
• and from Bokardo:http://bokardo.com/archives/designing-for-the-social-web-the-usage-lifecycle/