Contact Form 7 can manage multiple contact forms, plus it allows you to customize the form and the mail contents flexibly with simple markup. The form supports Ajax-powered submitting, CAPTCHA, Akismet spam filtering and other easy to install add-ons!
Plug-ins are great for being able to quickly add unique applications to your site. Maybe you need a poll, a cloud tag, or a twitter feed to spice up your sidebar. It is very likely that someone has created a plug-in that will suit your needs.