Are you looking for a contact form plugin for WordPress? If you value simplicity and flexibility, Contact Form 7 is a great choice.
Contact Form 7 is a wildly popular (and FREE) plugin that allows you to flexibly design the form and mail. You can manage multiple contact forms as well.
In addition, it supports many features including AJAX submitting, CAPTCHA, Akismet spam filtering, file uploading, etc.
Download Contact Form 7 from the WordPRess Plugin directory.
Documentation on Contact Form 7 is available.