I just want to give a shout out for Formidable Pro. I have been using the plugin on my own site and have convinced several of my clients to use it as well.
With all of its customization capabilities, you can turn out some pretty cool stuff for clients using forms and custom displays.
The best of all is their support. Anytime I run into an issue with some odd thing I am trying to do, Stephanie and Steve are both very quick to respond and help resolve the issue.
I’ve tried using some of the other form building solutions but nothing compares to what I have found with Formidable Pro!