The Most Popular Contact Form Plugins for Wordpress

** Download numbers recorded from the associated Wordpress plugin page on 2/21/13

Contact Form 7
9,911,000 downloads
Updated on 1/21/13
Still generates the HTML for tags, but shows the code, not a visual preview
Pros: supports Akismet, captcha, and Ajax submitting

Fast Secure Contact Form
3,432,000 downloads
Updated on 2/4/13
Interface is a bit klunky, but you don't have to mess with any HTML

Contact Form
575,000 downloads
Updated on 2/19/13
Appears to be written by a coder whose native language is not English
Might not support adding a variety of different fields

Custom Contact Forms
516,000 downloads
Updated on 1/10/13
compatible up to 3.4.2
"Rearrange fields with a drag-and-drop interface"
"Export form submissions to .CSV"
** Might not support radio buttons
"Manage options for your dropdowns and radio fields in an easy to use manager"
"Import and export forms/fields/styles/etc. with ease!"
-- Was planning to pick this plugin because of it's export and import features, but it is not listed as being compatible with 3.5.1 and there are no screenshots to be found.

Formidable Forms
302,000 downloads
Updated on 12/12/12
compatible up to 3.5.1
"Quickly and easily build forms with a simple drag-and-drop interface and in-place editing."
** Supports radio buttons

Easy Contact Forms
207,000 downloads
Updated on 6/27/12
appears to have a clean visual interface

Rising stars

Visual Form Builder
146,000 downloads
Updated on 2/8/13

"Build beautiful, fully functional forms in only a few minutes without writing PHP, CSS, or HTML."

** Supports radio buttons
One-click form duplication. Copy a form you've already built to save time
Use your own CSS (if you want)
*** Multiple field layout options. Arrange your fields in two, three, or a mixture of columns.

Form Maker
71,000 downlads
Updated on 2/20/13
Very visual interface that probably allows quick form creation.