My Fave: Wufoo
This HTML Form Builder helps you create contact forms, online surveys, and invitations so you can collect the data, registrations and online payments you need without writing a single line of code.
Wufoo gives anyone from students to secretaries to office managers the ability to publish an online form within minutes. Your forms, on your terms. Programming experience not needed.
Wufoo offers easy, copy/paste solutions for integrating a Wufoo form into a web page or your Facebook custom Page. For advanced users, full CSS and XHTML markup is also included.
Find out more on Wufoo.com