DRY forms (don't repeat yourself) which validate themselves server-side. Form results can be emailed. Hooks and options make plugin very flexible.
form_abort_on_email_failurefilter so that emails don't have to abort success
(form_)email_include_empty_fieldsto force empty fields to be included in emails.
maxchecks to number form inputs.
add_filter('form_email_message', 'wp_filter_post_kses')and some other email sanitation checks, just in case.
stripslashes()on request params regardless of
get_magic_quotes_runtime()(WordPress always escapes the global request params in wp-settings.php)
data-email-labelattribute can now be supplied on the input element, not just the
number, and range types
hiddenfield named '_form_name_submitted' captures the name of the form that is submitted so the server can match up the request with the corresponding form.