Formidable is hands down the best, most innovative and easy to use form builder for WordPress I've ever used. Calling this plugin a simple "form builder" is a bit of an understatement - people with no knowledge of HTML, CSS or programming can create extremely complex forms with ease.
Blair Williams (Caseproof)
This is by far one of the best plug-ins I've come across in a long time, if ever! It is truly a fine plugin with so many possibilities. I'm glad to know I bought the right one for a change!