SimpleModal Contact Form (developed by Eric Martin) is an ajax powered contact form that displays a lightbox effect when a user try to fill the contact form in your blog. It utilizes the jQuery JavaScript library and the SimpleModal jQuery plugin. SMCF has options to include certain contact form elements, like a Subject field and “Send me a copy” option for the sender.
Download: WordPress Plugin
This looks like a good alternative to the contact 7 plug-in for wordpress 🙂